What are the causes of abnormal noises in car air conditioning?

2 Answers
DiWalter
07/24/25 8:30am
Reasons for abnormal noises in car air conditioning: 1. Lack of lubrication due to insufficient refrigerant oil inside the compressor, causing metal friction sounds when the compressor's electromagnetic clutch engages; 2. Abnormal noises caused by excessive tension on the air conditioning belt; 3. Malfunction of the electromagnetic clutch, with damaged internal bearings producing abnormal sounds. The car air conditioning system is a device that cools, heats, ventilates, and purifies the air inside the vehicle, including refrigeration units, heating units, and ventilation devices. This combined system makes full use of the limited space inside the car, featuring a simple structure that is easy to operate. Car air conditioning provides a comfortable environment for passengers, reduces driver fatigue, and enhances driving safety.
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McBella
08/11/25 4:04am
There are many common causes of abnormal noises in car air conditioning systems, and I've encountered quite a few situations while repairing cars myself. The compressor may squeal, producing that harsh noise if the bearings are damaged or if the belt is loose and slipping. Then there's the blower fan blades - if they're clogged with leaves or dust, the AC will produce a constant buzzing sound when turned on. Additionally, refrigerant leaks can also cause abnormal noises as the system becomes unbalanced and the compressor doesn't work properly. I've also seen cases where a clogged expansion valve restricted refrigerant flow, creating a squeaking sound. When you notice unusual sounds from your car's AC while driving, it's advisable to check immediately rather than delay. You can start by identifying the sound source yourself: noises from the front compartment usually indicate compressor or belt issues, while sounds inside the cabin are mostly blower-related. Regular cleaning of the AC air intake can prevent foreign object blockages. If the noise persists, visit a professional repair shop promptly to avoid minor issues turning into major repairs.
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