What Causes the Noise When Turning on the Air Conditioning in a Buick Excelle?

1 Answers
SilasRose
07/30/25 4:25am
Due to the presence of air or moisture in the system's refrigerant, abnormal noises occur during the evaporation and expansion of the refrigerant. Specific reasons are as follows: Abnormal noises from the engine area when turning on the air conditioning. 1. Metal friction noise caused by the engagement of the compressor's electromagnetic clutch. 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 noises under the high pressure of the refrigerant. If the electromagnetic clutch itself is faulty or the internal bearings are damaged, abnormal noises will occur. In such cases, the compressor must be replaced. 2. Squeaking noise caused by excessive tension on the air conditioning belt. When the air conditioning is turned on, the system pressure rises rapidly. If there is insufficient refrigerant, it is necessary to first recover the refrigerant from the air conditioning system, evacuate the system, add sufficient refrigerant oil, then recharge the refrigerant, and run the air conditioning for a while to allow the refrigerant oil to circulate fully in the system.
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