What is the reason why the compressor of automobile air conditioner is particularly loud?

The reasons why the compressor of automobile air conditioner is particularly loud are: 1, the tightness of the compressor drive belt is poor, the electromagnetic clutch is easy to slip if it is too loose, the load of the electromagnetic clutch increases if it is too tight, and the abnormal sound will be generated if the drive belt is not tight; 2. The electromagnetic clutch is damaged. Compressors often run from low speed to high speed under high load, and electromagnetic clutches often come into contact with rain and soil. When the bearing in the electromagnetic clutch is damaged, it will produce abnormal sound; 3. When the throttle valve is dirty or stuck, the compressor will work after the air conditioner works, and the compressor is driven by the engine. Therefore, the load of the engine will increase after the air conditioner is turned on, which means that the engine should increase the throttle opening to increase the intake air. When the throttle valve has carbon deposition or is stuck, it will cause the engine to shake and produce abnormal noise, which will be more obvious after turning on the air conditioner.