What Causes the Car Air Conditioner to Be Particularly Loud?

[Kenneth]

The reasons for a loud car air conditioner are as follows: 1. The amount of refrigerant added exceeds the standard: This increases the compressor's load, leading to higher operational stress. You can check the air conditioner's sight glass; if liquid flows through with a few bubbles when the AC is on, the refrigerant level is normal. If there are no bubbles or very few, it indicates excessive refrigerant. 2. Verify if the refrigerant matches the original type: Using a different type can cause cooling issues. Currently, most refrigerants are R134a. 3. Loose belt tension: Inspect the compressor belt's tension. If too loose, it needs tightening, though over-tightening is less likely. 4. Compressor bearing damage: Noise may not be noticeable when the AC is off and the bearing operates alone. However, when the AC is on, the magnetic clutch engages the bearing to drive the compressor, increasing noise under load, necessitating bearing replacement.