What Causes a Loud Abnormal Noise When Turning on the AC in a Car?
1 Answers
When the car's air conditioning is turned on with the AC, the causes of abnormal noise are as follows: 1. Belt Slippage: The air conditioning compressor is driven by the engine crankshaft via a belt. When the belt is loose, aged, severely worn, or the pulley tension is insufficient, it can cause the belt to slip and produce abnormal noise. 2. Air Conditioning Compressor Failure: When the AC switch is turned on, the air conditioning compressor starts operating. If the compressor is damaged, it will produce abnormal noise. 3. Foreign Objects in the Air Duct: If there are foreign objects in the air conditioning system's duct, they can rotate repeatedly with the blower's airflow and collide with the air filter, resulting in abnormal noise.