What is the leading cause of AC compressor failures?
The most common cause of a compressor failure is inadequate lubrication. This may be the result of a refrigerant leak that allows compressor oil to leak out of the system. Typical leak points are hoses, hose and pipe connection (O-rings and flange gaskets), the evaporator, condenser or the compressor shaft seal. An electronic leak detector or dye should be used to find the leak so it can be repaired. Lubrication problems can also be caused by a blockage (typically the orifice tube) that prevents refrigerant and oil from circulating through the A/C system. Using the wrong type of compressor oil for the application or the wrong amount can also lead to premature wear and failure. A seized compressor won?t turn when the magnetic clutch engages, and you may hear squeals of protest from the drive belt. Or, the belt may have already broken or been thrown off its pulley when the compressor failed. A compressor may also have to be replaced if it is leaking, making excessive noise or not working
