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Why does the car make a squeaking sound when the air conditioning is turned on?

1 Answers

SebastianFitz

07/30/25 8:24am

Compressor belt tensioner wheel damage; compressor malfunction; internal and external circulation motor failure. Diagnostic methods: 1. Lack of lubrication: When the compressor electromagnetic clutch engages, it produces a metal friction sound. The fault is usually due to a lack of lubricating refrigerant oil inside the compressor. When there is insufficient refrigerant oil, the internal piston of the compressor does not receive adequate lubrication, resulting in metal friction sounds under the high pressure of the refrigerant. 2. Electromagnetic clutch failure: Another scenario is a malfunction in the electromagnetic clutch itself, where the internal bearing is damaged and produces abnormal noises. In this case, the compressor must be replaced. If there is a lack of refrigerant oil, it is necessary to first recover the refrigerant from the air conditioning system, evacuate the system, refill with sufficient refrigerant oil, then recharge with refrigerant, and run the car with the air conditioning on for a while to allow the refrigerant oil to circulate fully through the system. 3. High pressure: The air conditioning belt makes abnormal noises when the air conditioning is turned on. This situation occurs when the air conditioning system pressure rises rapidly upon turning on the air conditioning.

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