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Why Does the Car Air Conditioner Make Abnormal Noises?

1 Answers

DeMaci

07/30/25 4:22am

There are two main reasons why a car air conditioner emits abnormal noises, which can be categorized into two situations based on the different sounds: 1. The metal friction sound produced when the compressor electromagnetic clutch engages; 2. The squeaking sound caused by excessive force on the air conditioner belt. Diagnostic process: 1. Analysis One: When the compressor electromagnetic clutch engages and produces a metal friction sound, the fault is generally due to a lack of lubricating refrigerant oil inside the compressor. When refrigerant oil is insufficient, the internal piston of the compressor does not receive adequate lubrication during operation, resulting in a metal friction sound under the high pressure of the refrigerant. Another scenario is a fault with the electromagnetic clutch itself, where the internal bearing is damaged, causing abnormal noise. In this case, the compressor must be replaced. If refrigerant oil is lacking, it is necessary to first recover the refrigerant from the air conditioning system, evacuate the system, refill with sufficient refrigerant oil, then recharge the refrigerant, and run the air conditioner for a while to allow the refrigerant oil to circulate fully in the system. If the friction is severe, the compressor may also need replacement. 2. Analysis Two: The air conditioner belt makes abnormal noises when the air conditioner is turned on. This situation occurs when the air conditioning system pressure rises rapidly upon activation.

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