What Causes Engine Abnormal Noise When the Air Conditioner is On?

[MacElisa]

Abnormal engine noise when the car's air conditioner is turned on may be caused by faulty engine mounts, a malfunctioning air conditioning pump head, or bearing performance issues. Faulty engine mounts occur when the car's air conditioner is started, increasing the engine load. To maintain the current speed, the engine increases its own speed, which can lead to slight vibrations. When the engine mounts are faulty, resonance occurs, causing the engine to make noise. Air conditioning pump head failure mainly involves the engagement surface of the air conditioning electromagnetic clutch. If the electromagnetic clutch is worn, it can produce the aforementioned noise phenomenon, and replacement is recommended. Bearing performance failure refers to abnormal engine noise when the air conditioner is on, primarily involving the compressor clutch bearing. This type of fault source only occurs when the air conditioner is working and is directly related to acceleration. For bearing performance issues, it is advisable to visit a repair shop to inspect the above-mentioned repair recommendations.