Your car air conditioning often blows cold air and that’s normal, but sometimes it blows warm air and if it happens there is a problem on your car air conditioning system, however this may not also always indicates problem.
Car Problem Diagnosis
As you may not aware, a lot of cars have a device that temporarily disengage the car air conditioning compressor when the engine is under a lot of stress, this might be the case of your car and it’s normal.
How to find out if your car air conditioning is running under normal condition
(1) If your car air conditioning vents blows out warm air when the car engine is hot or under a lot of stress, this only means that your car is equipped with a safety feature that shut off the car air conditioning compressor when the car engine is hot or under a lot of stress, this case is normal and no problem in the car air conditioning system.
However, if your car air conditioning vents blows out warm air even if your car engine is not under a lot of stress or within the operating temperature then that’s a different story and this means a problem.
This kind of scenario is an indication of the car air conditioning problem, more often this kind of problem can be traced depending on the behavior of the car air conditioning system. If your car air conditioning vents initially blows out cold air then after quite a while it starts to blow out warm air then 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 car air conditioning 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 your car air conditioning vents blows out warm air in a random order then this suggest that the problem is a failing compressor or an air conditioning electrical problem.
During failing of compressor the refrigerant will stop flowing during the down time thus causing your air conditioning vents to blows out warm air sometime, also if you have car air conditioning electrical problem, usually an air conditioning wire is loose thus affect the air conditioning components to stop working during the time when a wire lost contact and have a broken circuit, consequently your car air conditioning blows out warm air.
Possible Cause of Car AC that Blows Warm Air
Expansion Valve Freezes up, Failing Air Conditioning Compressor or Car Air Conditioning Electrical Problem.
Auto About Auto Recommendation
Bring your car to a reputable auto 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.