Thesedays, my aircon sometimes blow out warm air when engine is idling, but it will be ok when the car is moving.
I suspect that the condenser fan is not running well.
My question is, how often does this fan cuts-in and run?
When I first on my air-con (while car is stationary), I realise that this fan doesn't run. Then it suddenly comes alive (together with another fan (radiator fan?) next to it) maybe 5 minutes later. Then after running for like 3 minutes, it will stop again....and won't come back on again until like 10 minutes later.
How to check if this fan is performing as it should?
Your fan at the heat exchanger in front of your car is likely working normally . When the aircon compressor clutches on(when you hear a fairly loud mechanical click noise), the fan motor will start to spin , when the compressor clutches off, the fan will stop spinning. You can confirm it by listening out for the compressor clutch on and off sound.
Your aircon get colder when car is moving because more air is flowing throw the heat exchanger when your car is moving, it help cooling down your aircon system better. When the car stop, the whole aircon system is depending on the fan to cool down the heat exchanger , the cooling will be not as good.
Bottom line is there is inefficiency somewhere along the system. In any aircon system, cooling comes from either the coil or the compressor, so likely one of the two. It is more likely that the compressor not functioning perfectly, of course it could be due to the cooling coil too but less likely.
But i notice you mentioned the exchanger fan will turn on 10 min after it is off, this is very long, the fan may have problem too. In our hot weather climate, the compresor will turn on in less than a minute or two, 10 min sounds far too long. Your aircon mechanic should be able to advise.
Edited by Ct3833, 12 June 2019 - 11:05 PM.