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What is the reason for a loud abnormal noise when the car's AC is turned on?

1 Answers

LaJude

07/29/25 3:00pm

The reason for a loud abnormal noise when the car's AC is turned on is: 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 lacks sufficient tension, it can cause the belt to slip, resulting in a hissing noise. If the belt slipping is caused by the belt itself, simply replacing the belt will resolve the issue. However, if the problem lies with the tensioner, then the tensioner needs to be replaced. The reasons for unpleasant odors in a car's air conditioning system are as follows: 1. Accumulation of dust in the indoor filter and copper coils: After prolonged use, dust can accumulate in the indoor filter and copper coils, and when this reaches a certain level, it can produce an odor. When the AC is turned on, this odor is dispersed into the air. 2. Moisture inside the indoor unit: After the air conditioning operates in cooling or heating mode, moisture often remains inside the indoor unit. If the AC is turned off immediately without a drying or anti-mold function, this moisture persists, leading to the growth of mold over time, which naturally produces a musty smell.

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