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What Causes the Buzzing Sound When Turning on the AC Button?

2 Answers

McAdelyn

07/29/25 2:10am

Possible reasons for the buzzing sound when turning on the AC button include belt slippage, air conditioning compressor failure, or foreign objects in the air duct. The corresponding solutions are as follows: Belt Slippage: The air conditioning compressor is driven by the engine crankshaft via a belt. If the belt becomes loose, aged, severely worn, or if the tensioner pulley lacks sufficient tension, it can cause the belt to slip, resulting in abnormal noise. If the issue is due to the belt, simply replace it. If the problem lies with the tensioner pulley, the pulley needs to be replaced. Air Conditioning Compressor Failure: When the AC switch is turned on, the air conditioning compressor starts operating. If the compressor is damaged, it may produce abnormal noise. It is recommended to visit a 4S shop for replacement or repair. Foreign Objects in the Air Duct: When there are foreign objects in the air conditioning system's duct, these objects can rotate repeatedly with the blower's airflow and collide with the air filter, causing abnormal noise. Remove the air filter and carefully inspect and clean any foreign objects in the duct.

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LeStephanie

08/12/25 6:10am

I've been repairing cars for twenty years and have encountered this humming noise many times, usually related to the air conditioning system. When the AC is turned on and the noise appears, the most common issue is a problem with the compressor, possibly due to worn bearings or loose mounting screws. Once the compressor is engaged, the load increases, and the humming noise is often accompanied by reduced cooling performance. The inspection method is simple: start the car, turn on the AC, open the hood, and listen to whether the sound is coming from under the front bumper or the compressor location. If the AC components are newly replaced, improper installation can also cause noise. Never ignore it—if the humming gets louder, it indicates severe internal friction, and prolonged neglect could lead to a complete system failure, resulting in high repair costs. It's recommended to check the AC filter monthly, clean the fan blades before use, and schedule regular comprehensive maintenance at a professional shop.

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