What Causes Abnormal Noise in Car Air Conditioning Compressor While Still Cooling?
3 Answers
Abnormal noise from the compressor is caused by internal faults. Here is an introduction to the compressor: 1. Introduction one: The compressor electromagnetic clutch is a common source of abnormal noise. The compressor often operates under high load, shifting from low to high speeds, which places high demands on the electromagnetic clutch. Additionally, the electromagnetic clutch is usually installed close to the ground and frequently exposed to rain and mud. When the bearing inside the electromagnetic clutch is damaged, it produces abnormal noise. 2. Introduction two: Repeated engagement of the electromagnetic clutch can also cause abnormal noise in the compressor. For example, insufficient power generation from the alternator, excessive pressure in the air conditioning system, or excessive engine load can all lead to repeated engagement of the electromagnetic clutch.
I often encounter this issue when repairing cars myself. If the compressor is making noise but still cooling, nine times out of ten it's due to worn bearings or pistons inside the compressor. When the AC is on, the compressor keeps running, and prolonged wear can cause squeaking noises. It could also be a loose belt slipping and creating friction noise. Normal cooling indicates that the compressor and refrigerant are basically fine. I suggest first checking the belt condition or whether the bracket screws are loose. Don’t underestimate these noises—if the bearings seize, the entire compressor could be ruined. Don’t cut corners on inspection; get it diagnosed by a professional shop as soon as possible. Regular maintenance checks on the AC system are crucial.
My car had the same issue last year, the AC was rattling but still blowing cold air. When I took it to the repair shop, they found that air had mixed into the refrigerant, causing bubbles to bounce around in the compressor like a drum. Another possibility was debris scraping inside the pipes or compressor. I noticed this problem often occurs in older cars, where aging parts and poor seals make them prone to air leaks. The mechanic diagnosed it quickly with a pressure gauge. Now, I make sure to clean the air intake during every maintenance. That annoying noise not only irritates but also affects the machinery's lifespan, so early intervention is the best solution.
