Air Conditioning Blows Warm at Idle

AC Does not Cool While at a Stop – Air Conditioning Blows Warm at Idle

There are many explanations for why a cars AC might not cool when at a stop and blows cool only when going. The most typical reason is the cooling fan for the condenser isn’t functioning. It is important to understand that lots of times the cooling fan is shared by the condenser and radiator, other times there are JUST two different ones. Exactly why a poor cooling fan can change the AC so dramatically is the proven fact that heat from refrigerant (Freon) is generally cooled when passing through the condenser. Therefore, even if the condenser fan isn’t working, maybe it doesn’t change the AC as the vehicle is going at highway speeds. This is only because air is passed through the condenser when driving down the road so the fan isn’t desired. The condenser is completely determined by the cooling fan to cool it down, after the vehicle is at a stop. On occasion the cooling fan might be operating, but it might be going too slowly to adequately cool the condenser. A test light may be utilized to confirm that it’s getting power and ground for the electrical plug in, to assess the motor. If ground and power is present as well as the motor isn’t functioning, the motor has an open circuit. Whenever the cooling fan motor is worn, it might be started occasionally briefly by softly tapping in the electric fan motor having a little hammer or wrench. Replacing the motor will be crucial, when that is done when the fan turns at all. This is merely another method to confirm that it’s receiving the electricity it should function. Also bear in mind a cooling fan may begin at any given time (some even come on with the engine off) so take care not to stick your hand in the way of the blades! Note when the cooling fan motor has grabbed, chances are the fuse has blown also. So when there isn’t any electricity to the fan as well as the motor is locked up, a fuse will probably have to get replaced at that period of the fan motor replacement.

Other Reasons for Auto AC Not to Cool at an Idle or perhaps a Stop

The automobile might be overheating – caused by something else other than the cooling fan.
When the vehicle is overheating, Efficiency can be altered by heat transfer from the radiator to the condenser.

The AC compressor might not be pumping adequately at slower RPM’s (revolutions per minute).
An expansion valve might not be regulating the refrigerant accurately.
Condenser fins might be bent or even the condenser might be obstructed by debris.
You will find special condenser fin combs to straighten condenser fins. In my experience, bent condenser fins are not that much of the common issue. A far more prevalent problem should you drive in the nation, is pollen collected over time between the fins. Garbage from your road just like a plastic bag or piece of paper obstructing area of the condenser reducing operation can occur anywhere. It really is funny to me that during my time as an auto tech, many customers came in concerned the AC wasn’t cooling, but didn’t notice the car was overheating – even when the temperature gauge was pegged!

 Air Conditioning Sydney 

ACG Air Conditioning Guys
182A Canterbury Rd, Canterbury NSW 2193
(02) 8021 3735

Leave a Reply