What Causes Loud Noise in Car Air Conditioning Compressors?
2 Answers
Loud noise in car air conditioning compressors can be attributed to factors such as poor clutch quality and improper tension of the drive belt. Below are the reasons for loud noise in car air conditioning compressors: 1. Poor clutch quality: The electromagnetic clutch of the compressor is a common source of abnormal noise. The compressor frequently operates under high load, transitioning 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 often exposed to rain and dirt. When the bearing inside the electromagnetic clutch is damaged, it can produce abnormal noise. 2. Improper tension of the drive belt: The tension of the compressor drive belt also directly affects the lifespan of the electromagnetic clutch. If the drive belt is too loose, the electromagnetic clutch is prone to slipping; if the drive belt is too tight, the load on the electromagnetic clutch increases. Improper tension of the drive belt can, at best, cause the compressor to stop working, and at worst, lead to compressor damage. When the drive belt is in operation, if the compressor pulley and the generator pulley are not aligned in the same plane, it can reduce the lifespan of the drive belt or the compressor.
There could be multiple reasons for increased noise from the car's air conditioning compressor. Based on my years of experience in auto repair, common issues include internal compressor problems such as bearing wear or piston sticking, which worsen with prolonged use and cause squeaking sounds. Another possibility is insufficient refrigerant, making the compressor work as if it's idling, resulting in loud noise and increased fuel consumption. A loose belt is also a major cause, producing squealing noises when driving. Additionally, loose mounting brackets can lead to vibration noises. These issues are not minor—I've encountered cases where delayed repairs resulted in complete compressor failure and costly replacements. It's advisable to stop and check belt tension upon hearing any unusual sounds or visit a professional shop for a comprehensive diagnosis to avoid secondary damage to other components, which can affect driving safety and AC efficiency, especially when using the AC in hot weather when problems become more pronounced.
