One of the leading causes of a car stalling with the A/C on is a seized compressor. If there’s screeching, smoking, stalling and the air blows warm out of the vents whenever the AC is turned on it’s a good guess that the compressor has locked up. If there is just a belt squealing but the car doesn’t stall and the AC cools, more than likely the belt or the tensioner is worn. The most likely cause of a car not idling high enough and sometimes stalling with the A/C turned on without any of the other issues mentioned can be an IAC (Idle Air Control) motor.*Keep in mind the compressor could be hot to the touch when checking.How to check for a locked up or seized compressor Try to turn the clutch plate (on the end of the cpompressor). Using a socket on the nut that holds the clutch plate on – see if it can be turned. Look for signs of the clutch plate over-heating; discoloration. If the belt is loose it may be because of a worn serpentine belt tensioner, but this alone won’t cause the car to stall. A sticking IAC motor can cause the car to stall. An IAC motor typically… Read full this story
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