What causes loud abnormal noise when the Nissan Sylphy's air conditioning is turned on?

[McOmar]

Sylphy air conditioning abnormal noise reasons include air conditioning compressor failure, air conditioning belt slippage or wear, air conditioning pipeline blockage, electromagnetic clutch failure, foreign objects in air conditioning vents, etc. Air conditioning compressor failure: If the air conditioning compressor fails, it will cause abnormal noise or failure to cool/heat in the car's air conditioning system. This situation is relatively complex and it's best to have professionals at a repair shop or 4S store conduct detailed inspection. Air conditioning belt slippage or wear: If the air conditioning belt is loose, it will slip or idle, causing abnormal noise. If the air conditioning belt is severely worn, friction will also produce abnormal noise. In this case, it's best to directly replace with a new belt. Air conditioning pipeline blockage: If pipelines in the air conditioning system are blocked, internal gas cannot circulate normally, producing abnormal noise. This requires inspection and cleaning of the entire pipeline system of the car's air conditioning. Electromagnetic clutch failure: If foreign objects enter the electromagnetic clutch, it will cause bearing noise. This requires cleaning and repair of the electromagnetic clutch. Foreign objects in air conditioning vents: If there are foreign objects in the air conditioning vents, abnormal noise will naturally occur during air delivery. This only requires cleaning.