What are the symptoms of a faulty car air conditioning compressor?
1 Answers
The symptoms of a faulty compressor are as follows: 1. Compressor seizure - The compressor fails to rotate. The cause is poor lubrication or lack of lubrication. For instance, if the refrigeration oil leaks due to refrigerant leakage, or if the oil overflow pipe of the evaporator, the oil overflow valve of the POA valve, or the oil hole of the oil-gas separator (accumulator) in the CCOT system is blocked, the compressor may seize due to insufficient refrigeration oil. 2. Compressor leakage - There are two scenarios: oil leakage and gas leakage. In minor cases, only refrigerant leaks; in severe cases, both refrigerant and refrigeration oil leak. There is also slight leakage at the shaft seal. If the annual leakage is less than 14.2g, it does not affect the refrigeration system's performance and is considered normal. If the leakage exceeds 14.2g, maintenance is required, including replacing the seals. If the compressor's cylinder block cracks and causes leakage, the compressor should be replaced. 3. Poor compressor operation - A manifold pressure gauge can be used to measure the compressor's suction and discharge pressures. If both pressures are the same and the compressor feels abnormally hot when touched, the cause may be cylinder gasket blow-by. High-pressure gas from the discharge valve leaks back into the suction chamber through gaps in the cylinder gasket, gets compressed again, and produces even hotter vapor. This cycle can carbonize the refrigeration oil, rendering the compressor useless. If the intake or discharge valve springs are damaged or weakened, the compressor may fail to compress the refrigerant or compress poorly. In this case, the suction and discharge pressures may be the same or similar, but the compressor will not overheat.
