Car Clinic: My car's air-con is blowing warm air, even after regassing. Why?

Car Clinic: My car's air-con is blowing warm air, even after regassing. Why?

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Car Clinic: My car's air-con is blowing warm air, even after regassing. Why?

Q. I’ve had my Vauxhall’s air-conditioning regassed but it’s still blowing warm air. The pressure is fine.

HS, Huddersfield

 


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A. Most garages have regassing equipment but not all bother to diagnose faults. It could be a faulty compressor or radiator cooling fan (or their circuitry).

Start the engine from cold with the air-con off. Ask someone to turn the air-con on while you stand by the open bonnet. You should hear the radiator fan start to run within a couple of seconds. Then you should hear a click, which is the compressor switching on. If either sound is missing, you know where the fault lies.

Note: if the fan is faulty, the system may still blow cold air when the car is moving, because air is flowing through the radiator.

 

Sunday Times Driving Car Clinic: Tim Shallcross, advance driving advice

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Tim Shallcross used to train AA patrols to fix cars. Now he advises the Institute of Advanced Motoring — read more from Tim here.

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