What are the causes of abnormal noise in a car's air conditioning pump?

[NadiaLee]

Car air conditioning pump abnormal noise causes are: 1. The electromagnetic clutch is contaminated with sewage or mud, causing damage to the inner bearing and resulting in abnormal noise; 2. Loose drive belt increases the load on the electromagnetic clutch; 3. Repeated engagement of the electromagnetic clutch leads to insufficient power generation from the alternator; 4. Excessive gap between the electromagnetic clutch and the compressor; 5. Lack of lubricating oil inside the compressor. Functions of car air conditioning: 1. Drawing in fresh air from outside for ventilation and air exchange, preventing window fogging; 2. Removing dust, odors, smoke, and toxic gases from the car's interior air, making the air inside the car fresh, and humidifying the car's interior air to increase relative humidity.