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May Automotive Parts Manufacturing & Supplying Co,.Ltd

What are the Reasons for the Car AC Compressor Not Working and How to Check?


The car air conditioner compressor is an important component of the car air conditioning system. It is the heart of the car air conditioning refrigeration system, with a powerful function of compressing and delivering refrigerant vapor. However, sometimes the car air conditioner compressor may fail to work. So what are the reasons for the car air conditioner compressor not working? 


Reasons why the car air conditioner compressor doesn't work


  • Circuit system failure can cause the car air conditioning compressor to not function effectively. After such a failure, the owner can check whether the circuit is unobstructed and inspect the temperature sensor solenoid valve.

  • The car air conditioner compressor is mainly used for compressing and delivering the refrigerant. When problems occur, check if there are any leaks in the refrigerant. If there is no refrigerant to be compressed or delivered, it naturally will not work.

  • Serious wear and tear inside the compressor can lead to its inability to function normally. Since the compressor plays a crucial role in the air conditioning system, its main function is to compress and deliver the refrigerant. This causes the compressor to be in a high-speed rotation state for a long time, so this is also one of the reasons why the compressor cannot work normally.

  • Loose plugs in the control circuit of the car air conditioning compressor can cause poor contact, resulting in a decrease in the voltage supplied to the electromagnetic coil and unstable current, causing the air conditioning compressor's electromagnetic clutch to engage and disengage intermittently.


Troubleshooting when the car air conditioner compressor does not work


  • When the low-pressure gauge is much lower than the normal value, and there is blurred fog flow visible in the mirror, and there is no temperature difference between the high and low-pressure pipes, and the air conditioning is not cold, it indicates that the refrigerant is leaking seriously.

  • When the indication of the low-pressure gauge is close to zero and the indication of the high-pressure gauge is much lower than the normal value, the air conditioning system usually shows non-cold wind, frost on the pipes before and after the car ac expansion valve, which may be due to the blocking of the expansion valve frosting, resulting in the refrigerant cannot be circulated in the system. At this time, repeated vacuum extraction and refrigerant re-adding should be performed. Alternatively, the temperature sensor package of the expansion valve may be damaged, causing the expansion valve to not open, in which case the temperature sensor package should be checked.

  • When the indications of both the high and low-pressure gauges are much lower than the normal value, this may be due to internal faults of the car air conditioning compressor, such as damaged valve plates or valve plate gaskets, and the compressor needs to be replaced (internal faults of the compressor will not cause the low-pressure gauge to indicate too low).

  • When the indications of both the high and low-pressure gauges are much lower than the normal value, this may be mainly due to insufficient refrigerant. During inspection, there will be a slight heat in the high-pressure pipe, and the low-pressure pipe will be slightly cold, but the temperature difference is not very large, and bubbles appear every 1-2 seconds in the mirror. At this time, leaks should be checked first, and then the refrigerant should be replenished.

    There are some other car air conditioning system related products are as followed:

    Car Cabin Air Filter

    Car AC Expansion Valve

    Auto AC Evaporator

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