What Causes the Car's AC Compressor to Make Noise When Turned On?

[Matilda]

Here are the specific reasons for abnormal noise from the car's AC compressor: 1. Contaminated electromagnetic clutch: Due to the electromagnetic clutch's proximity to the ground, long-term driving can expose it to sewage or mud, damaging the internal bearing and causing noise. 2. Loose drive belt: The car's AC compressor requires high performance from the electromagnetic clutch during operation. A loose drive belt increases the load on the electromagnetic clutch, making it prone to damage and potentially burning out the compressor. 3. Repeated engagement of the electromagnetic clutch: Frequent engagement of the electromagnetic clutch can lead to insufficient power generation from the alternator, causing the compressor to operate with inadequate voltage and resulting in noise. 4. Lack of lubricating oil: Insufficient lubricating oil inside the compressor. After prolonged use, it's essential to add lubricating oil appropriately to prevent noise or failure due to friction.