Search cartechhome.com

Nov 20, 2017

Why is my car air conditioner not blowing cold air?

It is normal for car air conditioner to blow cold air, but what if your car air conditioner not blowing cold air anymore but instead it blows warm air? If this is the case then there is problem with your car air conditioning system, however this may not also always indicates problem.


How to determine if the car air conditioning is running under normal condition?
(1) If the car air conditioning vents blow warm air when the car engine is hot or under a lot of stress, it means that the car is equipped with a safety feature that shut off the compressor. Most cars have device which temporarily disengage the compressor of  the car air conditioning when an engine is under a lot of stress or when the engine is extremely hot and this is normal.

But, if car ac vents blows out warm air even when the engine is not under a lot of stress or the engine is within the operating temperature then that’s a different story and this means a problem. With this kind of condition it indicates problem, which is more often depend on how the air conditioning functions. If the ac vents initially blows out cold air then after quite a while it starts to blow warm air the problem is a freezing up expansion valve.
If an air conditioning expansion valve freezes up, the flow of refrigerant to the air conditioning lines will be block temporarily which can cause the AC vents to blow out cold air initially then afterward begins to blow out warm air. The car expansion valve can only be freezing up if there is moisture on the refrigerant and this moisture can only be entering via leak on your car air conditioning system.

(2) If the car AC vents blows out warm air in a random order then this suggest that the problem is a failing compressor or an AC electrical problem.

During failing of compressor the refrigerant will stop flowing during the down time thus causing the air conditioning vents to blows warm air sometimes.

If there is car air conditioning electrical problem -usually an air conditioning wire is loose- it affects the air conditioning components and will stop working during the time when a wire lost contact of if the circuit is broken, consequently the car AC blows out warm air.

Possible cause of car ac that blows warm air
1. Expansion valve freezes up
2. Failing air conditioning compressor
3. Car air conditioning electrical problem

What to do?
Bring the car to a reputable repair shop specializing in car air conditioning system. If the problem is about Expansion valve freezes up, ask the mechanic to locate the leak that causes the moisture to enter into the system and mixed it up with the refrigerant.

However, if that is not the problem then ask the mechanic to inspect your car air conditioning compressor and car air conditioning electrical wiring.