What causes the abnormal noise in the Mercedes-Benz E-class air conditioning?

[VonJosiah]

Mercedes-Benz E-class air conditioning abnormal noise is caused by the failure of the compressor electromagnetic clutch and the tightness of the compressor drive belt. Compressor electromagnetic clutch failure: The compressor frequently operates under high load conditions, 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 often exposed to rain and mud. When the bearings inside the electromagnetic clutch are damaged, abnormal noise occurs. Compressor drive belt tightness: 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 drive belt tightness can, at best, cause the compressor to stop working and, at worst, lead to compressor damage. When the drive belt is operating, if the compressor pulley and the generator pulley are not aligned in the same plane, it will reduce the lifespan of the drive belt or the compressor.