What Causes Abnormal Noise in Car Compressors?
4 Answers
Abnormal noise in car compressors may be caused by the electromagnetic clutch being installed too close to the ground or insufficient lubrication. Below are detailed explanations of the causes of abnormal noise in car compressors: Electromagnetic clutch installed too close to the ground: The compressor frequently operates under high loads, transitioning from low to high speeds, which places high demands on the electromagnetic clutch. Additionally, the electromagnetic clutch is typically installed close to the ground and often exposed to rainwater and dirt. When the bearings inside the electromagnetic clutch are damaged, abnormal noise can occur. There should be a certain gap between the electromagnetic clutch and the compressor mounting surface. If the gap is too large, the impact will increase; if the gap is too small, the electromagnetic clutch may interfere with the compressor mounting surface during operation, which is another common cause of abnormal noise. The solution is to maintain a certain distance between the electromagnetic clutch installation position and the ground and ensure an appropriate gap with the compressor mounting position. Insufficient lubrication in the compressor: The compressor requires reliable lubrication during operation. When the compressor lacks sufficient lubrication or the lubricant is improperly used, severe abnormal noise can occur inside the compressor, potentially leading to wear and even failure of the compressor. It is essential to promptly check whether the lubricant level is adequate.
Last time I was driving, I heard a clicking noise when I turned on the AC, like metal rubbing against metal, which was really annoying. I took it to the repair shop, and the mechanic said the bearings or pistons inside the compressor might be worn out, especially in older cars or those that frequently drive long distances. A loose or worn belt can also cause strange noises, sounding like a sharp whistle. Additionally, insufficient refrigerant can make the compressor run idle, producing a buzzing sound, and ignoring it for too long might even burn out the entire system. I think if you hear these kinds of noises, don’t delay—get it checked by a professional shop right away to avoid turning a small issue into a costly repair. You can also check if the belt is tight yourself, but internal problems should be diagnosed with proper equipment for safety.
My vintage car has been running for ten years, and the compressor noise occasionally pops up. At first, I didn’t pay much attention to the squeaking sound, but later it grew louder, like a drumbeat. The mechanic took it apart and found that the aging belt was slipping, causing unstable drive, with the noise originating from poor engagement of the compressor clutch. Rusted compressor bearings are a common cause, especially in hot weather. Refrigerant leaks in the cooling system increase the compressor’s load, producing creaking sounds that threaten the AC’s functionality. Experience tells me that as soon as I hear unusual noises, I should stop and inspect—first checking belt tension, then measuring refrigerant pressure. Early repairs save time and effort; otherwise, delaying could lead to a complete compressor failure, resulting in costly replacement. Driving safety comes first—never dismiss strange noises as minor issues.
While driving, the air conditioning compressor suddenly made loud noises, like a buzzing or rattling sound, which was quite alarming. It could be due to worn internal parts of the compressor or friction caused by a loose belt. Insufficient refrigerant can also easily trigger abnormal sounds. Additionally, loose external mounting screws can cause rattling noises. This issue affects driving comfort and, if severe, can shorten the compressor's lifespan. It's recommended to have a technician inspect it as soon as possible and avoid risking continued driving. For a simple self-check, you can record the abnormal sound with your phone and let a professional listen. Repair costs depend on the severity, and early treatment is cheaper.
