Why Is Your Carís Air Con Not Cold?

Bradley Jando | Monday 30th August 2021 3:09pm

Air Conditioning Vents inside a Car

As summer reaches its peak, keeping cool in your vehicle has never felt more important. Thereís nothing quite like beating the heat while driving. But if all your air conditioning seems to do is blow hot air in your face, there are a whole host of things that could be wrong with it.

If your carís cooling system has left you feeling red-faced recently, read on to find out some reasons why.

Checking your carís air con

Your carís air con health is not typically checked in a usual service. Since air conditioning in a car is more of a comfort than a safety feature, mechanics will prioritise things like brake and engine oil checks instead.

But that doesnít mean your carís air con isnít important.

Book a Free Air Con Check with Kwik Fit today for a diagnosis of why your carís internal climate is not cool anymore. It could be any one of the following reasons:

1. Your need an air con regas

As the most common reason for poor air-con performance, the level of charge left in your AC system is likely to be the culprit for all that hot air.

To solve this problem, youíll need to undertake an air con regas procedure. This can be a complicated process, so it is recommended that you get a specialist to regas your air conditioning system for you.

2. Your air con condenser is blocked or damaged

Your carís condenser is a crucial part of your air conditioning system.

Working to convert the hot, high-pressure gas from the compressor into a cool liquid, the condenser is the element responsible for the cooling factor. Over time, dust and dirt particles can accumulate there, reducing the efficiency of the condensing process and eventually causing a blockage.

If this blockage is not addressed soon enough, it can cause damage to the condenser. When blocked or damaged, the condensed liquid is no longer able to be cooled effectively ó hence the hot air. Every so often, it is advised you visually inspect the front of your car condenser for debris.

3. Your air con fans have failed

The condenser can also cause problems if its fan motors fail. This, again, is caused by the accretion of dust and dirt in the condensing system, but can also be triggered by electrical issues like a blown fuse.

The motor fan can also be damaged by collected debris, preventing the flow of cool air. Repairing fans can be a tricky process, so trust it to one of our professionals.

4. Your air conís refrigerant is leaking

Another common reason for a carís air con failure is leaking refrigerant.

But, what is refrigerant? Refrigerant is the low-flammability cooling fluid that maintains the pressure of your air conditioning system. A leak can occur anywhere across the whole system. If this happens, the pressure drops and all elements underperform Ė especially the compressor.

Check for an oily liquid leaking in your air conditiong system but be careful not to touch any of the liquid as it can be extremely dangerous.

Sometimes, a leak can be fixed by placing sealant over the weakened area. However, occasionally all the refrigerant needs to be flushed out and replaced. For this procedure, we recommend you get in touch with your local Kwik Fit centre for specialist help.

5. Your compressor has failed

The element responsible for pumping the refrigerant around the AC system is called the compressor. If this fails, the overall pressure of your carís cooling system will decrease, causing a noticeable drop in performance. Compressor failure can have a number of causes, most notably leaking refrigerant, as mentioned above, or an electrical fault in your vehicle.

6. There is an electrical fault

If your carís electrical system is not working properly, your air conditioning doesnít stand a chance. Blown fuses, switch failure, and a shorted blower control circuit are all possible culprits. While these issues are often minor and easily treated, if left unattended for long periods of time, more serious problems can occur such as acid buildup.

Get an air con regas & other services at Kwik FitÖ

With one of our Free Air Con Checks, we can diagnose the issue with your air con.

If youíre struggling to keep cool in your car, get in touch with your local Kwik Fit centre today to find out about our air con maintenance services.

Any facts, figures and prices shown in our blog articles are correct at time of publication.

registration plate

Please enter your postcode to see availability information from your local Kwik Fit centre.

Exclusive Online Pricing

We are committed to offering customers our most competitive prices on tyres and more. Read about our exclusive online pricing.

Locate A Centre

Kwik Fit has over 600 centres across the UK including Northern Ireland, many of which are open 7 days a week for your convenience.


We offer a series of FAQs to help you learn more about our services or your vehicle.

Customer Care

0800 75 76 77
You can reach our customer care team 6 days a week from 9:00am to 6:00pm on Monday and Thursday, 8:30am to 6:00pm Tuesday, Wednesday and Friday, 8:30am to 5:00pm Saturday, and 10:00am to 4:00pm on Bank Holidays.