Why Does the Car Air Conditioning Make a Buzzing Noise When Turned Up High?

[LaSimon]

Reasons why the car air conditioning makes a buzzing noise when turned up high: 1. The amount of refrigerant added exceeds the standard, which increases the compressor's load and consequently raises the workload; 2. Verify whether the added refrigerant is the same as the original one. If not, air conditioning cooling issues may arise. Currently, most refrigerants are R134a; 3. Check if the tension of the compressor belt is normal. If it's too loose, it should be tightened. The possibility of the belt being too tight is quite low; 4. The compressor bearing might be damaged. When the air conditioning is off and the bearing operates on its own, the noise may not be noticeable. However, when the air conditioning is turned on, the magnetic head and the bearing engage together to operate, driving the internal workings of the compressor. This increased load may result in louder noise. In this case, simply replacing the compressor bearing will suffice.