FAQ'S || WE'RE SERIOUS ABOUT AIR-CONDITIONING.
If we've not been able to answer your question on A/C & Heating Repairs, Auto Electrical, RV Repairs, General Enquiry or Refrigeration, please get in touch so that we can answer your specific question.
COOLCAR FAQ'S || AIR-CONDITIONING & HEATING QUESTIONS
Why is my car's air-conditioning system not blowing cold air?
The most common reason a vehicle’s air-conditioning system stops working properly is low refrigerant, usually caused by a leaking component somewhere in the system.
Your A/C system is designed to be sealed, so if refrigerant is low, it has usually escaped through a leak. Common leak points can include the condenser, compressor, evaporator, hoses, seals, or pipework.
Before we re-gas the vehicle, we need to identify and repair the cause of the leak. This is important because any refrigerant we put into the system will simply escape again if the faulty component is not repaired or replaced first.
At CoolCar, our goal is to fix the root cause of the problem, not just temporarily refill the system. Once the leak has been repaired, we can evacuate, test, and re-gas the system properly so your air-conditioning has the best chance of staying cold and reliable.
Why does my car's air-con only work sometimes, like in the morning?
The most common reason for intermittent air-conditioning performance is gradually depleting refrigerant, usually caused by a leak somewhere in the system.
Refrigerant is what allows the A/C system to absorb heat and cool the air before it comes through your vents. When the refrigerant level drops, the system may still work when the outside temperature is mild, such as in the morning or evening, because the A/C does not have to work as hard.
However, once the day heats up, especially in the middle of the day, the system needs to perform under much greater pressure and heat load. If the refrigerant level is too low, or another component is weak, the A/C may stop cooling properly just when you need it most.
This is why many customers find their A/C seems fine first thing in the morning, but struggles or stops working when the weather is hotter.
At CoolCar, we test the system to find the cause of the problem rather than simply re-gassing it. If refrigerant is low, there is usually a leak that needs to be found and repaired before the system is re-gassed properly.
Why does my car's A/C keep needing to be re-gassed?
If your car’s air-conditioning keeps needing to be re-gassed, it usually means there is a leak somewhere in the system.
A vehicle A/C system is designed to be sealed. Refrigerant should not simply “run out” through normal use. If the refrigerant level is low, it has escaped from somewhere; commonly through a leaking condenser, compressor, evaporator, hose, seal, or pipework.
A re-gas on its own is only a temporary fix. Depending on the size of the leak, a re-gas may last anywhere from a few days to a couple of years, but the underlying problem is still there.
At CoolCar, we focus on finding and repairing the cause of the refrigerant loss before re-gassing the vehicle. This gives your A/C system the best chance of staying cold, reliable, and properly repaired, rather than needing repeat top-ups.
Why does my vehicle's air-conditioning system stop working when in traffic?
If your air-conditioning works while you are driving but stops cooling properly in traffic, it often means the system is struggling when there is less airflow through the front of the vehicle.
When you are moving, natural airflow helps cool the condenser at the front of the vehicle. When you are stopped or moving slowly in traffic, the system relies much more heavily on the cooling fans to keep temperatures and pressures under control.
Common causes include:
Faulty condenser or radiator fans
Low refrigerant caused by a leak
A blocked, dirty, or damaged condenser
Weak compressor performance
Pressure sensor or fan control faults
Electrical relay, fuse, or wiring problems
Engine cooling system issues affecting A/C performance
If the condenser cannot get rid of heat properly, the A/C may stop cooling, cycle on and off, or blow warm air when the vehicle is stationary.
At CoolCar, we test the A/C system under the right conditions to find out whether the issue is caused by airflow, fan operation, refrigerant level, pressure control, or another fault. Once we have confirmed the cause, we can explain the repair options before proceeding.
How do you look for leaks?
Our initial A/C inspection includes leak detection. We check the system carefully using a combination of visual inspection, hands-on testing, and specialised electronic leak detection equipment.
Some leaks can be found by looking for signs such as oil staining, damaged components, worn seals, corrosion, or obvious refrigerant residue around common leak points like the condenser, compressor, hoses, pipework, and fittings.
If the leak is harder to find, we may recommend a tracer gas test. This involves pressurising the system with a specialised test gas, then using a highly sensitive hydrogen leak detector to trace where the gas is escaping.
Tracer gas testing is especially useful for small or hidden leaks, including leaks behind the dashboard or in areas that are difficult to access. It allows us to pinpoint the source of the leak more accurately before recommending the right repair.
How much will it cost to fix my air-conditioning?
It is difficult to provide an accurate repair price without inspecting the vehicle first, because air-conditioning faults can have several different causes.
In many cases, A/C problems are caused by a refrigerant leak. The cost of repair depends heavily on where the leak is coming from and which component needs to be repaired or replaced. For example, a leaking seal, hose, condenser, compressor, or evaporator can all involve very different parts and labour requirements.
That is why we carry out an initial inspection first. This allows us to diagnose what has caused the problem, identify the faulty component, and prepare a proper quote for the complete repair, including labour.
Once we know what is required, we’ll explain the issue, outline the repair options, and provide a quote before proceeding with the work.
Can you repair rear air-conditioning faults in vans, SUV's and people movers?
Yes! Not only can we diagnose rear A/C faults and test them for leaks but we can also install rear air-conditioning and roof-top A/C units into almost all vehicles. An air-conditioning evaluation is necessary first so that we can get an understanding as to the layout and electrical components inside the car to quote the necessary modifications and/or repairs.
Is there any consequence to re-gassing a leaking air-conditioning system?
Yes! Refrigerants, R22, R134a, R12 and R1234YF are all synthetic greenhouse gasses meaning they have great Global Warming Potential and are subsequently harmful to the environment and ozone layer.
Additionally, running your vehicle's A/C system with less than the intended amount of refrigerant for your vehicle can A) Alter the pressure inside the A/C system and force leaks, B) Upset modern day compressors by having them pump less refrigerant than their programmed to, and C) Seize compressors, as when the refrigerant is leaking out, so is the oil that lubes up the spinning compressor bearing.
As this is a mechanical component it requires lubricant to keep spinning. This can also escalate to the compressor spitting metal filings through your car's A/C system, ensuring all the parts must be flushed or replaced to remove the metal filings. Compressors are the 'heart' of the A/C system, they are not cheap to replace, hence it's best to keep it healthy by ensuring the refrigerant is kept exactly where it should be.
Can A/C issues cause my car to be smelly?
Yes, a smelly car can be caused by the air-conditioning system.
Moisuture naturally builds up around the evaporator inside the dash when the A/C is running. Over time, this damp environment can allow bacteria, mould, mildew, dust and organic matter to build up, which can create an unpleasant smell through the vents.
After a preliminary check to judge whether the smell is mildew related or that you're smelling refrigerant and oil from a leaking evaporator; We may recommend a deodorisation treatment, depending on the vehicle and the type of smell being emitted from the vents. A deodorisation treatment typically includes an ozone machine, and bactigas treatment, and/or an anti-fungal/bacterial treatment applied to the evaporator coils to help reduce bacteria, mould and odour at the source. We'll also consider the replacing the cabin air filter, if upon inspection it is filthy.
Why are my window's not demisting?
If your windows are not demisting properly, it is likely because your vehicle's heating, air-conditioning or ventilation system is not working as it should. Some don't realise that the A/C system helps to demist your windows, even during the winter time. The A/C removers moisture from the air before it is blown onto the glass, which aids in clearing condensation much faster.
If your demister is blowing air but the windows stay foggy, the system may not be drying or directing the air properly. If the airflow is weak, there may be a blockage, filter issue or fan fault.
We'll check your A/C, heating, cabin filter and airflow to find out why your windows are not clearing as they should. Having established the cause, we can recommend the best repair or treatment to get your demister working as it should.
Some common issues of poor demisting include:
Low refrigerant or an A/C system fault
A blocked or dirty cabin filter
Weak airflow from the vents
A faulty blower fan
Heater or temperature control issues
Recirculation mode staying on
Blocked vents or air intake areas
Excess moisture inside the vehicle
Water leaks into the cabin
Faulty heater controls, blend doors, or actuators
Are there any car's that are renowned for air-conditioning issues?
Yes! Unfortunately, there are plenty of makes and models that are much more prone to air-conditioning issues than others. Examples include:
Hyundai Ionic
Hyundai Kona
Kia Sorento
Mazda CX-5
Ford Ranger
Honda Civic
These are just a few popular models that are prone to specific air-conditioning faults. Cool Car has spent decades compiling practical knowledge of common faults across a wide range of vehicles. In some cases, we have also developed repair methods that address manufacturing issues rather than simply replacing failed parts and leaving the same underlying issue to happen again. Our goal is to carry out repairs that are accurate, durable, and appropriate for the vehicle.
What refrigerants can you work with?
CoolCar are automotive air-conditioning specialists, we are proficient with repairs on not only R-134a refrigeration systems, but also the newer R-1234yf refrigeration systems. We can also perform conversions of R-12 to R-134a refrigeration systems.
Additionally, CoolCar are the ONLY automotive air-conditioning repairer that can diagnose and repair air-conditioning issues on cars that run an R-744/CO2 refrigerant, such as S-Class Mercedes, in the entire Southern Hemisphere.
COOLCAR FAQ'S || GENERAL QUESTIONS
Can you fit customer supplied parts?
Yes, CoolCar are happy for customers to source their own parts if that is your preference, however having not purchased parts ourselves, and without knowing where they came from, we cannot offer any kind of warranty on a part we did not supply. Parts we supply however have a 12-month warranty.
What happens if parts are hard to find?
CoolCar has its very own parts-finding-specialists. We've been in the industry for a very long time, and had the chance to build a lot of connections. It is very rare for CoolCar to be unable to find parts suitable for your vehicle.
Our general procedure is to find parts and quote the repair accordingly during the initial 20-45min inspection that we perform on your car. However, on the off-chance that we do need to spend more time searching for the right bits, or speak to our suppliers, we'll will provide a written explination as to what we have found and the parts required, and get back to you with pricing once we have had more time to investigate.
if customer would prefer a second hand component the warranty is either limited to 3 months, or the suppliers guarantee.
Should I book in advance before coming in?
During the Summer it is imperative that you book in prior to coming in to see us, However, we often still have same-day slots available to be booked, and will go above and beyond to fit you in when it suits you best. We are a Summer seasonal business and are often booked solid during this period, regarding all things, motorhomes, auto electrical and air-conditioning.
In our off season, the Winter period is much slower, you have a much better chance of being seen to as soon as you walk in the door.
Do you use aftermarket or genuine parts for repairs?
CoolCar primarily use aftermarket parts for repairs, as they are generally cheaper, more accessible and better reinforced than OEM parts. However, depending on availability OEM parts may be necessary. CoolCar can also fit second-hand parts either according to necessity or customer preference. However, second-hand part usage has a bearing on the provided warranty.
Can you supply A/C parts to me so that I can do the work?
Yes, CoolCar are happy for customers to source their own parts if that is your preference, however having not purchased parts ourselves, and without knowing where they came from, we cannot offer any kind of warranty on a part we did not supply. Parts we supply however have a 12-month warranty.
Can you inspect multiple issues in one visit?
This depends on the scale of the two issues. Extra time may be required to examine the extent of your troubles, as well as additional charges, that would be discussed prior. takled on a case by case basis.
What model's of car's do you work on?
Enter youCoolCar are air-conditioning & heating specialists we can fit or repair air-conditioning systems to all vehicles; cars, trucks, tractors, boats, trains and planes, etc. We've been in business for a long time, and have a raft of experience. No model of car is out of our expertise:
Abarth
Acura
Alfa Romeo
Alpine
Aston Martin
Audi
BAIC
Bentley
BMW
Borgward
Bugatti
Buick
BYD
Cadillac
Changan
Chery
Chevrolet
Chrysler
Citroën
Cupra
Dacia
Daewoo
Daihatsu
Dodge
Dongfeng
DS Automobiles
Ferrari
Fiat
Fisker
Ford
Foton
GAC
Genesis
Geely
GMC
Great Wall
Haval
Holden
Honda
Hongqi
Hyundai
Infiniti
Isuzu
Iveco
JAC
Jaguar
Jeep
Kia
Koenigsegg
Lamborghini
Lancia
Land Rover
LDV
Leapmotor
Lexus
Lincoln
Lotus
Lucid
Mahindra
Maserati
Mazda
McLaren
Mercedes-Benz
MG
Mini
Mitsubishi
Nissan
Opel
Pagani
Peugeot
Polestar
Pontiac
Porsche
Proton
Ram
Renault
Rivian
Rolls-Royce
Saab
SEAT
Škoda
Smart
SsangYong / KGM
Subaru
Suzuki
Tata
Tesla
Toyota
Vauxhall
Volkswagen
Volvo
Wuling
XPeng
Zeekrr content...
Why do some of your branches have an initial inspection fee?
All of our branches at CoolCar have an initial inspection unless there is a promotion going on to discount or make inspection's free of charge.
Do you supply courtesy or loan cars whilst my car is with you?
Yes! CoolCar has a fleet of courtesy available to be provided to you. These cars are regularly maintained and are free of charge for your conveince. However, CoolCar is not responsible for filling these vehicle with petrol, nor do we expect you to bring the cars back with a full tank. Fuel is your responsibility,. If the car's are in high demand we prefer to have them reserved for customers going ahead with repairs, instead of for those who just have evaluation bookings.
What payment methods do you accept?
CoolCar accepts Visa, Master Card, Eftpos, Cash, contactles and afterpay payments methods. Additionally, all online transactions made when booking your vehicle in are secured with Stripe.
Can I drop my vehicle off before or after your working hours?
CoolCar are happy for you to drop your vehicle off outside of our business hours, and have secure locations for you to leave your keys. However, CoolCar cannot take responsibility for your leaving your vehicle parked outside. Please phone to arrange this.
Do I need to pay a deposit?
Deposits are generally not necessary, however, if we need to order parts internationally, generally not returnable, and with a transit time 7-10days, we may request a deposit to cover the cost of the part and the associated freight.
What should I bring with me to my appointment?
Yourself, your vehicle and any associated paperwork you may have if you've attempted to have the issue repaired or diagnosed elsewhere.
Can I have my car repaired under my Mechanical Breakdown Policy?
Absolutely. If you've purchased your vehicle from a second-hand car dealership within the last three years, you may have also purchased a Mechanical Breakdown Policy. If so, you can claim air-conditioning and heating repairs on your policy.
CoolCar will handle opening the claim and liaising with your Insurance company to provide the necessary information and receive confirmation on repairs. Depending on the policy you purchased and the Insurer, has a bearing on any exclusions from the policy, which are then owed by the customer. We may also ask to have previous service documents provided, as required by your insurance company.
Upon having the quote approved by your insurance company, we will then get in touch to discuss your share with you. Upon your acceptance, we will proceed with the necessary repairs.
What warranty do you offer on your repairs?
All our repairs come with a 12-month warranty on the repairs performed. This includes warranty on labour, parts and refrigerant used in the repair. Unless stated otherwise due to the condition of parts. (Any exceptions will firmly be discussed with you when you receive the quote to ensure your understanding and permission).
If your vehicle happens to return with an air-conditioning fault, or part leaking unrelated to the repairs we've performed within the last 12-months. Refrigerant and some sundries will be covered under warranty, however, any parts and labour unrelated to the original repair will not be covered.
Do you offer any discounts for SuperGold Card Members?
Yes! CoolCar offers SuperGold Card members 20% off labour on the whole repair.
Please mention your SuperGold Card when booking or when you bring your vehicle in so we can apply the discount correctly!
COOLCAR FAQ'S || CAR HEATING QUESTIONS
Why is my car heater blowing cold air?
Unfortunately, there are numerous reasons as to why your car's heater could stop working. Symptoms often relate to:
Heater cores and coils
Radiators and heater hoses
Heater blower motors
Thermostats and temperature sensors
Electronic heating controls and blend doors
Faulty demisters and fogging issues
Etc... It can be hard to diagnosed what has caused your issue over the phone, so it's best if you bring the vehicle in to see us so that we can get a much better understanding as to the issue you're experiencing and what is causing it. Once we've concluded the fault, we can run you through a quote for repairs and come up with a plan with you, to get your car back to being warm, safe and dry.
Why is there no airflow from my car heater vents?
If you're finding that your car is not producing adequate airflow at the vents when on the heater function, your issues could be caused by a blocked cabin air filter, a faulty blower motor, and rarely, an externally blocked heater core.
If you're experiencing low poor airflow from the vents of your car, we recommend that you bring your vehicle in to see us so that we can take a look at it and pinpoint exactly what has caused this issue. Once we've come to a conclusion we can take you through a quote and advise you on the appropriate repairs for your vehicle to ensure airflow is restored.
Why are my window's not demisting?
If your windows are not demisting properly, it is likely because your vehicle's heating, air-conditioning or ventilation system is not working as it should. Some don't realise that the A/C system helps to demist your windows, even during the winter time. The A/C removers moisture from the air before it is blown onto the glass, which aids in clearing condensation much faster.
If your demister is blowing air but the windows stay foggy, the system may not be drying or directing the air properly. If the airflow is weak, there may be a blockage, filter issue or fan fault.
We'll check your A/C, heating, cabin filter and airflow to find out why your windows are not clearing as they should. Having established the cause, we can recommend the best repair or treatment to get your demister working as it should.
Some common issues of poor demisting include:
Low refrigerant or an A/C system fault
A blocked or dirty cabin filter
Weak airflow from the vents
A faulty blower fan
Heater or temperature control issues
Recirculation mode staying on
Blocked vents or air intake areas
Excess moisture inside the vehicle
Water leaks into the cabin
Faulty heater controls, blend doors, or actuators
Can a leaking heater core cause wet carpet?
Yes, a leaking heater core can cause wet carpet inside the vehicle, usually in the front footwell area. The heater core sits inside the vehicle's heater box, so if it, or the heater core inlet/outlet pipes, seals or hose connections are leaking, then coolant can escape into the cabin.
However, wet carpets aren't always caused by the heating system. Air-conditioning faults can also cause moisture to accumulate inside the vehicle. Common A/C related issues include a blocked evaporator drains which prevents condensation from draining outside the vehicle, or excess condensation caused by low refrigerant or poor evaporator performance.
It's best to bring the vehicle in to see us at one of our workshops so that we can get a better understanding as to what exactly has caused the wet carpets, as it is difficult to diagnose this issue over the phone or without having seen the vehicle. Once we've determined the source of the moisture we can quote you for the necessary repairs accordingly.
Can low coolant affect my vehicle's heater?
Yes. Low coolant can stop your vehicle's heater from working properly, as the heater replies on hot coolant flowing through the heater core to warm the air entering the cabin.
If the coolant level is low, there may not be enough coolant reaching the heater core, which can cause poor or intermittent, heat at the vents. Low coolant can also allow air into the cooling system, creating air locks that restrict flow though the heater core.
Low coolant issues should be checked thoroughly, as it may indicate a leak from the radiator, hoses, water pump, heater pipes, etc. Additionally, this can lead to the engine overheating if left unresolved.
To confirm any coolant issues, bring your vehicle in to see us so that the leak can properly be diagnosed, and quoted for your approval.
Can a faulty thermostat cause poor cabin heating?
Yes, if the thermostat is faulty, this can cause poor cabin heating because it controls how the anti-freeze through the engine and the cooling system.
Functioning like a temperature dependant valve - If the thermostat is stuck open, the engine may take too long to reach its normal operating temperature. This is because the heater relies on the hot coolant flowing through the heater core. This can mean the heater only blows lukewarm air, especially when driving on the open road.
To confirm whether the thermostat in your car is not working as intended, come in to one of our workshops so that we can properly diagnose and confirm this fault before quoting you for the necessary repairs.
Can mixing different coolants affect the heating system?
Yes, mixing different coolants/anti-freeze can affect the heating system. Mixing the wrong coolants can cause chemical reactions and incompatibility that often inhibit the efficiency of your vehicle's heating system. Additionally, differing corrosion inhibitors found in anti-freeze is designed for specific engine and cooling system materials. If used incorrectly or mixing different types can cancel out those protections or create deposits. Including:
Sludge , gel or abrasive filament forming in the cooling system
Blocked heater core or radiator
Reduced corrosion protection
Damage to aluminium components
Seal and gasket deterioration
Exacerbated water pump wear
Overheating and/or poor performance
Hence it is important that anyone going near your vehicle's heating system has a good understanding of what antifreeze can already be found in your vehicle, and that which is recommended to ensure no mishaps are caused.
Is poor heating a sign of a cooling system problem?
Yes. Poor cabin heating can be a sign of a cooling system problem, as your vehicle's heater relies on hot coolant flowing through the heatercore to warm the air entering the cabin.
If there is low coolant, an air lock, a blocked heater core, faulty thermostat, leaking heater pipe or poor coolant circulation, the heater may blow cool or lukewarm air, work only sometimes, or struggle to demist the windscreen, among other things.
Poor heating should not be ignored, especially if it is accompanied by low coolant levels, engine overheating, a sweet smell inside the vehicle, wet carpets, or warning lights. These symptoms indicate a leak or cooling system fault that should be checked out as soon as possible to ensure the well being of yourself and your vehicle.
Can heater issues cause my car to be smelly?
Yes! Heater and ventilation problems can cause your car to have an unpleasant smell.
If you're experiencing a sweet, syrupy smell - this could indicate leaking anti-freeze, potentially onto the carpets in your front footwells.
A damp musty smell could be caused by moisture trapped in the heater or air-conditioning system, a blocked evaporator drain, mould or baceria growing in the system or a dirty and blocked cabin air filter.
Burning smells can point to electrical faults such as a failing blower motor, dodgy wiring, or debris in the vents.
As different smells point to different faults, we recommend that you bring the vehicle in to see us so that a qualified technician can examine the system, to diagnose the issue. Once the fault has been concluded, we'll quote the necessary repairs and come up with a plan to get your vehicle's heating system back to top quality.
Are there any car's that are renowned for heater issues?
Yes! There are some makes and models of vehicles that are more prone to having heating issues. However, less so than vehicles that have air-conditioning issues. One common vehicle that often faces heating issues is a Ford Focus.
Should I keep driving my car if my vehicle's heating stops working?
This depends on what has caused your vehicle's heating system to stop working.
If you're finding that in conjunction with your heater issues, the temperature gauge is rising, your engine is overheating, you can smell a sweet smell, or that your front footwell carpets are moist - It's likely that your heating issue is caused by a coolant leak. It is not advisable to drive the vehicle whilst the engine is compromised.
If the heater is not producing warm air, yet the engine temperature appears normal, you're likely okay to drive the vehicle in to see us so that we can examine the system, and accurately determine what has caused your vehicle's heating to stop working. We can prepare a plan and quote for repairs from there to address the issue.
Why does my heater fan only work on highspeed?
If you're finding that your heater is only working on a high fan speed, it is likely caused by a faulty blower motor, or fan speed resistor. These parts control the lower fan speeds, so often times when they fail, the fan may only operate on full speed.
This could also potentially be caused by damaged wiring, a faulty fan switch, poor connections, or issues with the heater/ac control panel.
If you're having trouble with your fan not blowing, or your heater only functioning on high fan speeds, bring your vehicle in to see us so that we can pinpoint what exactly has caused your car's fan to stop working as intended. Once diagnosed, we can prepare a quote and walk you through the repairs necessary to get it back to working order.
Can you repair heating systems in classic cars?
Yes. CoolCar can repair, restore, and adapt heating systems in classic cars, custom vehicles, hot rods, and older vehicles where original parts may be difficult to source.
We can assess heater cores, heater boxes, blower motors, heater taps, hoses, controls, vents, demisters, airflow problems, coolant leaks, and electrical faults. Where replacement parts are no longer available, we can often repair existing components, make or adapt heater hoses, or recommend a practical solution to get the heating and demisting system working properly again.
Whether you want to keep the vehicle as original as possible or improve comfort and usability, we can help find the right repair approach for your classic vehicle.
Can using Stop-Leak damage my heater core?
Yes! Stop leak products can potentially damage or block a heater core. A heater core has very small holes, and stop leak is designed to seal holes similar to this. Whilst it may temporarily slow down a coolant leak. It can also collect inside the radiator, thermostat, heater tap, and hoses.
This can restrict coolant flow and cause poor cabin heating, intermittent heat, or more extensive cooling system problems.
Stop-leak may have a place as a short-term emergency measure. But it should certainly not be treated as a proper repair. The best approach would be to identify the source of the leak and have it repaired correctly, then re-fill the system with the correct coolant for the vehicle and bleed off the air remaining in the cooling system.
Why is one side of my car cold and the other side warm?
If one side of the vehicle is warm and the other side is cold, this is often caused by a faulty in the air distribution system or temperature control system.
Many modern vehicle's have dual-zone climate control. if the system is not working correctly, one side may receive heated air whilst the other side stays cool.
Common causes include a faulty blend door actuator, stuck or broken temperature flap, electrical faults, blocked heater core, or restricted coolant flow.
In some vehicles, a partially blocked heater core can also cause the uneven eating across the cabin. The correct repair depends on whether the issue is with coolant flow, airflow direction, electronic controls or the heater box itself.
We reccomend that you bring the vehicle in to see us so that we can determine what exactly has caused the vehicle's heating system to stop working as intended. This way we can quote the necessary repairs accordingly to get your car back to being dry, safe and cosy.
COOLCAR FAQ'S || CARAVANS & MOTORHOME REPAIRS QUESTIONS
What can you repair on my RV?
CoolCar North Shore & Hamilton can rectify all sorts of issues you may be having with your caravan or motorhome. Our technicians have a wealth of knowledge and experience, and can work on all RV's so we can help you with:
RV Cooling, Heating & Power Systems
Rooftop A/C repair & installation
Diesel heater installation
Battery testing, replacements & upgrades
Off-grid solar panel systems
Battery management (incl. REDARC systems)
Auto Electrical Diagnostics & Repairs
Auto electrical repairs by qualified techs
RV diagnostics & fault finding
Satellite systems & 12V accessory setups
Portable fridge/freezer repairs
Appliance installs (fridges, fans, lighting)
General Maintenance & Interior Repairs
Engine servicing for motorhomes
Plumbing repairs & upgrades
Cabinetry repair & carpentry
Tow bar installation
Bike rack & roof rack installs
Whilst repairs proceed, your vehicle will be kept secure under lock and key, enclosed at our premises. Our workshops are big enough to house multiple RV's for extended periods if necessary.
Please note, that as we can get parts and accessories in quickly from a wealth of local suppliers, that we rarely keep or sell specific parts or accessories in stock.
Can you repair electrical issues in my motorhome?
Yes. CoolCar can diagnose and repair many electrical issues in motorhomes, caravans and RVs, particularly faults relating to appliances, fridges, batteries, charging systems, lighting, control panels, switches, wiring, plugs, sockets, and 12V power supply problems.
RV electrical faults can be frustrating because the issue is not always with the appliance itself. A fridge, heater, pump, light, or control panel may appear faulty, when the real problem is low battery voltage, poor connections, damaged wiring, a failed switch, voltage drop, or an issue with the charging system.
We can test the relevant parts of the system, identify where the fault is coming from, and explain the repair options before going ahead.
Where a job involves regulated mains electrical work or specialist certification, we will let you know and arrange or recommend the appropriate qualified tradesperson. This means you still benefit from our practical RV repair experience, while ensuring any regulated work is completed and signed off correctly.
We repair many RV electrical faults, and if the job requires specialist electrical certification, we’ll make sure the right qualified person is involved.
Do you provide any benefits to NZMCA Members?
Yes! CoolCar Air-Conditioning centres, North Shore, Hamilton and Henderson provide a 25% discount on labour for all caravan and motorhome repairs. Additionally, we also provide a 20% discount on labour on all repairs for those holding a Super Gold membership card. Please note, these two discounts cannot be applied together, rather its one or the other.
Just flash us confirmation of your SuperGold or NZMCA Membership and we'll apply the discount right away.
Do I need to bring the vehicle to your workshop, or can you come to me?
Unfortunately, our mobile service is reserved for heavy machinery, on-site equipment and trucks and tractors, planes, etc. Coming in and seeing us is the best way to receive the attention your motorhome needs, with the most amount of care.
Do you provide quotes before carrying out repairs?
Yes. Once we have inspected or diagnosed the vehicle, appliance, or system, we can provide a quote before carrying out repairs.
In most cases, we need to assess the issue first so we can identify the cause of the fault and understand what parts, labour, refrigerant, materials, or specialist testing may be required. This helps us provide a proper quote rather than guessing from symptoms alone.
We will explain what we have found, outline the recommended repair, and provide pricing before proceeding with the work. If anything changes during the repair, or if additional faults are found, we will contact you before carrying out any extra work.
What brands do you work with?
CoolCar is an authorised Dometic Service Dealer, which means we are approved to repair and replace Dometic products and assist with Dometic warranty claims.
We also work with a wide range of other leading motorhome and caravan brands, including Truma, Thetford, Thule, and many others.
Because motorhomes and caravans often use a mix of appliances, accessories, and specialist components, we’ll assess what you have, talk you through the available options, and help match the repair or replacement solution to your needs.
Whether you need an appliance repaired, a fridge replaced, a bike rack fitted, or a roof awning installed, we’ll do our best to recommend a practical option that suits your vehicle, budget, and how you use it.
Can you replace a faulty rooftop air-conditioning unit?
Yes. CoolCar can assess and replace faulty rooftop air-conditioning units on motorhomes and caravans.
Before recommending replacement, we will usually inspect the unit to confirm the fault and check whether repair is a practical option. Some issues may be caused by electrical faults, control problems, poor power supply, blocked airflow, fan faults, or damaged components rather than the whole unit needing replacement.
If replacement is the best option, we can talk you through suitable rooftop A/C options for your motorhome or caravan, including compatibility, size, cooling capacity, power requirements, and availability.
Once the right unit has been selected, we can remove the faulty unit and install the replacement. If any regulated electrical certification or final sign-off is required, we will arrange or recommend the appropriately qualified specialist to complete that part of the job.
Can you perform an EWOF or Gas Certification on my motorhome or caravan?
CoolCar does not issue Electrical Warrants of Fitness (EWOFs) or Gas Certificates ourselves, as these must be completed by appropriately qualified certifiers.
However, we can help with many of the repairs, checks, and preparation work that may be needed before your motorhome or caravan is certified. This includes pre-WOF and pre-EWOF checks, appliance fault-finding, fridge repairs, electrical diagnosis, lighting issues, battery and charging concerns, and general motorhome or caravan repair work.
Where your repair involves LPG fittings, gas connections, ventilation, compliance, or final gas sign-off, we can arrange or recommend a suitably qualified gasfitter to complete the certification side of the job.
This means you still benefit from CoolCar’s practical experience with motorhome and caravan appliances, fridges, electrical systems, accessories, and repairs, while ensuring any regulated electrical or gas certification is completed by the right qualified specialist.
In simple terms: we can help diagnose, repair, prepare, and carry out pre-WOF or pre-EWOF checks, but the final EWOF or gas certification must be issued by the appropriately qualified certifier.
COOLCAR FAQ'S || AUTO ELECTRICAL REPAIRS & DIAGNOSTICS QUESTIONS
What types of auto electrical problems can you diagnose?
Our talented and experienced autoelectrical staff have the knowhow to repair all the electrical systems in your car. Whether is wiring in a new stereo or advanced repairs like CAN bus faults we have the skills to get the job done. See below to learn more about the talented technicians that will be working on your vehicle.
Auto Electrical work is offered at our Hamilton, North Shore and, Manukau stores.
Auto electrical work often requires some investigation and is usually not the quickest fix. Please acknowledge that it is best to leave your vehicle with us whilst we resolve the issue. We will keep you updated. Loan cars are available
Starters
ABS wiring
Damaged wiring
Reset service light
Batteries
Windscreen wiper issues
Radio instillation
Resolving warning lights
Scanning all vehicle systems with our range of scan tools
SRS warning light/Supplementary restraint system/airbags
Alternators
Wheel speed sensors
Short circuits
Engine hard starting
Central locking
Engine overheating issues
GPS installation
Electric seat function (incl heated seats)
Radiator and condenser cooling fan issues
Engine check light
Trailer wiring
Engine sensors
Engine non-starting
Fuel pump
Poor running
Electric Windows
ABS check light/anti-lock braking systems
Cruise control (incl aftermarket systems)
Diagnosis of electrical faults (broken wires and short circuits)
Differential Diagnosis of actual fault using scan tool information to resolve fault described.
Can you install my aftermarket car stero?
Yes. You can either bring your own stereo unit to us for installation, or come in with an idea of what you would like and we can talk you through the available options.
Once you have chosen a suitable stereo, we can confirm the installation requirements and provide a quote. If we are supplying the unit, we’ll let you know once it arrives and book your vehicle in for installation.
Because every vehicle is slightly different, the final cost can depend on what is already fitted, what needs to be adapted, and whether any extra parts are required, such as fascia kits, wiring harnesses, steering wheel control adapters, reverse camera integration, or aerial adapters.
Can you diagnose parasitic battery drains?
Yes! Battery drains can be caused by things like faulty modules, relays, lights staying on, aftermarket accessories, alarm systems, stereos, trailer wiring, control units not going to sleep properly, or wiring faults.
Because these faults can be intermittent, diagnosis can take time. We may need to test the battery and charging system first, then monitor current draw, check circuits, and isolate what is staying active when it shouldn’t be.
Once we find the cause, we’ll explain what is happening and provide repair options before proceeding.
Do I need to bring the vehicle to your workshop, or can you come to me?
Unfortunately, our mobile service is reserved for heavy machinery, on-site equipment and trucks and tractors, planes, etc. Coming in and seeing us is the best way to receive the attention your vehicle needs, with the most amount of care.
How long would you need the vehicle for?
If you book an auto electrical diagnostic or repair appointment online, the booking time may show as one hour. This is the appointment slot only, and does not always reflect how long the diagnosis or repair will take.
Auto electrical faults can be complex, especially if the issue is intermittent, hidden in the wiring, or related to modules, relays, sensors, batteries, charging systems, or accessories. In many cases, we may need the vehicle for longer than the initial booking time.
Please book your appointment for a day when you are able to leave the vehicle with us for the full day if required. This gives our technicians the best chance to properly test the fault, confirm the cause, and provide accurate repair advice rather than rushing the diagnosis.
Loan cars may be available by request. If you need one, please let us know in advance so we can check availability and reserve one for you.
Can you quote an auto electrical repair without seeing the vehicle?
Not reliably. Auto electrical issues can be complex, and it is impossible to confirm the root cause without examining and testing the vehicle ourselves.
Many symptoms can have more than one possible cause. For example, a flat battery, warning light, starting fault, non-working accessory, or intermittent electrical issue may be caused by the battery, alternator, wiring, relays, sensors, modules, switches, poor connections, aftermarket accessories, or something else entirely.
We may be able to give general advice based on the symptoms you describe, but we cannot accurately diagnose or quote the repair until we have inspected the vehicle.
The best option is to book the vehicle in for auto electrical diagnosis. Once we have tested the relevant systems and confirmed the cause, we can explain what we have found and provide repair options before proceeding.
Can you replace the hybrid battery in my car?
Yes. CoolCar can replace hybrid batteries, and we are partnered with InfinitEV so we can offer high-quality hybrid battery solutions from a specialist supplier.
InfinitEV’s approach aligns well with how we like to do things: focusing on long-term repair value, reliable battery solutions, and making environmentally responsible choices wherever possible. Before recommending replacement, we will assess the battery's health free of charge and confirm the fault. This check takes us about 15mins. Hybrid battery issues can sometimes be caused by battery module failure, cooling fan problems, wiring faults, battery management issues, or related electrical faults, so proper diagnosis is important.
Once we know what is required, we can talk you through the available options, including battery replacement, availability, warranty, and expected repair pathway.
COOLCAR FAQ'S || FRIDGES, FREEZERS & APPLIANCE QUESTIONS
Can you repair 3-way fridges?
Yes! CoolCar are adept at diagnosing and fixing issues with 3-way fridges. However, please note that due to recent guidelines on gas safety that any alteration or repair performed to gas appliances requires the vehicle pass a gas certificate.
We start off with an initial inspection, due to the extent of the issue we may need to bench test your fridge for up to three days
What appliances do you repair/install for motorhomes and caravans?
CoolCar can repair ovens, fridges, freezer, water heaters, heaters, water pumps, toilets and more
We repair many motorhome and caravan gas appliances, including gas fridges, water heaters, and related appliance faults.
Because LPG systems in motorhomes and caravans are regulated, some parts of the job must be checked and certified by a qualified gasfitter. Where certification is required, we arrange for a certifying gasfitter to inspect the gas fittings, connections, ventilation, and installation requirements, and issue the final gas certification.
Our practical experience repairing motorhome and caravan appliances, along with the reassurance that the gas installation is checked and signed off by the appropriately qualified specialist; assures a quality repair.
We can repair many gas appliance faults, but the final gas compliance check and certification must be completed by a certifying gasfitter.
When do I need to have a gas certificate re-issued
A new gas certificate is generally required whenever gasfitting work has been carried out or the LPG installation has been altered.
This may include work such as:
Replacing or relocating a gas fridge
Replacing or installing a gas water heater
Changing LPG pipework, fittings, regulators, or bottle/storage arrangements
Adding or removing gas appliances
Altering ventilation or flue arrangements
Disconnecting and reconnecting gas appliances as part of a repair
A new certificate is not usually required just because time has passed, unless your insurer, buyer, rental provider, campground, or another compliance authority asks for current proof.
If we are only carrying out non-gas work, such as 12V electrical diagnosis, appliance electronics, cabinetry, seals, or air-conditioning work unrelated to LPG, this does not normally trigger a new gas certificate.
Is it better to repair or replace my fridge?
This depends on the age of your fridge and what has caused it to stop working. Motorhome and caravan fridge faults can have a range of causes, so we always recommend properly assessing the appliance before deciding whether repair or replacement is the better option.
CoolCar can inspect and test your fridge or freezer, then talk you through what we find. We’ll explain the likely cause of the problem, the repair options available, and how the cost of repair compares with replacing the unit.
We’ll give you our honest recommendation based on the condition of the appliance, parts availability, expected reliability, and overall value for money. The final decision is always yours, but our goal is to help you make an informed choice rather than guessing or replacing a fridge unnecessarily.
Do you repair compressor fridges in caravans and motorhomes?
Yes. CoolCar can diagnose and repair many compressor fridge faults in caravans, motorhomes, RVs, boats, and portable fridge/freezer units.
Compressor fridges can stop working for several reasons, including power supply issues, low voltage, faulty wiring, failed PCBs, thermostat or temperature sensor faults, compressor faults, fan issues, poor ventilation, blocked airflow, or cooling system problems like a lack of refrigerant
Because the fault is not always inside the fridge itself, we test the fridge and its power supply properly before recommending a repair. In some cases, the fridge may need to be removed or bench tested so we can confirm the cause of the fault accurately.
Once we have diagnosed the issue, we’ll explain what we’ve found, check parts availability, and let you know whether repair or replacement is likely to be the best option.
What are the most common portable fridge/freezer faults?
The most common portable fridge/freezer faults include poor cooling, not turning on, intermittent operation, error codes, noisy running, or the fridge running but not getting cold enough.
Common causes can include:
Faulty PCBs or electronic control modules
Faulty thermostats or temperature sensors
Failed thermocouples
Compressor or cooling unit faults
Fan faults or blocked airflow
Damaged lids, hinges, seals, or latches
Damaged power leads, plugs, sockets, or adapters
Low battery voltage or voltage drop through the 12V supply
Faulty switches, displays, or control panels
Refrigeration system faults or gas/leak-related issues
Portable fridge/freezers often rely heavily on both the appliance itself and the power supply feeding it, so a proper diagnosis is important before deciding whether the fridge is faulty or whether the issue is coming from the vehicle, battery, wiring, or plug connection.
We test the fridge/freezer and its key components before recommending repair or replacement. Once we have assessed the unit, we’ll explain what we’ve found, what parts may be required, and whether repairing the fridge/freezer is likely to be good value compared with replacing it.
How long will you need my fridge/freezer for to diagnose and repair?
CoolCar diagnoses fridge and appliance faults before recommending repairs. The time required can vary depending on the type of fridge, the symptoms, and what has caused the issue.
When you bring your fridge in, one of our technicians will usually take a quick initial look to assess its general condition, confirm the issue you are experiencing, and understand what you need from the fridge.
In many cases, we will need to keep the fridge for up to three days so we can carry out a proper bench test. This allows us to test the fridge under workshop conditions and accurately diagnose the fault, rather than guessing or replacing parts unnecessarily.
Once the fault has been confirmed, we can prepare a quote for the necessary repairs, check parts availability, and provide an estimated timeframe. We’ll then come back to you with the information you need to make an informed decision about whether you would like to proceed with repair or replacement.
