What is the reason for the abnormal noise of automobile air conditioning refrigeration?

The following are the specific reasons for the abnormal sound of automobile air conditioner refrigeration: 1, dirty or the throttle valve is stuck: after the air conditioner works, the compressor will also work with the engine, so the load of the engine will increase after the air conditioner is turned on. The engine should increase the throttle opening to increase the air intake. When the throttle valve has carbon deposit or is stuck, it will cause engine jitter and abnormal noise. 2. Abnormal sound of air-conditioning pump: There are two main reasons for abnormal sound of air-conditioning pump. The abnormal noise of electromagnetic clutch and bearing of air conditioning pump is mainly due to the wear of electromagnetic clutch, which leads to the increase of gap. The abnormal noise of air-conditioning pump bearings is mainly due to the lack of lubricating oil, which will lead to the burning of air-conditioning pump and the inability to carry out refrigeration work. 3, the compressor drive belt is not tight: the drive belt is too loose and the electromagnetic clutch is easy to slip; If the drive belt is too tight, the load on the electromagnetic clutch will increase. Improper tightness of the drive belt will cause abnormal sound and damage the air conditioner compressor.