Why does the car AC make noise and not cool when turned on?

1 Answers
EverlyRose
07/29/25 6:03pm
Reasons for car AC making noise and not cooling when turned on are as follows: 1. Belt slipping: The AC compressor is driven by the engine crankshaft via a belt. If the belt is loose, aged, severely worn, or the pulley tension is insufficient, it can cause the belt to slip, resulting in a hissing noise. 2. AC compressor failure: When the AC switch is turned on, the AC compressor starts operating. If the compressor is damaged, it may produce a hissing noise. 3. Foreign objects in the air duct: If there are foreign objects in the AC system's air duct, they can rotate with the blower airflow and repeatedly hit the air filter, causing a hissing noise.
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