What are the reasons for a car's air conditioning making particularly loud noises?

[DeMila]

The reasons for a car's air conditioning making particularly loud noises are: 1. The type of refrigerant added to the air conditioning system is different; 2. There is an issue with the tightness of the air conditioning compressor belt—if it's too loose, it can cause the air conditioning to be excessively loud; 3. Excessive refrigerant has been added to the air conditioning system, increasing the compressor's load and consequently the overall burden. The functions of a car's air conditioning system include: 1. Achieving a cooling effect through the continuous transformation and circulation of refrigerant; 2. Drawing fresh air from outside into the car for ventilation and air exchange, preventing window fogging; 3. Using the engine coolant, waste heat, or heat generated by a burner as a heat source for warming, which is then heated by the heater and blown into the car by the blower to raise the temperature for heating purposes; 4. Removing dust, odors, smoke, and toxic gases from the car's interior air to freshen it, and humidifying the car's air to increase its relative humidity.