What Causes the Hissing Sound When the Car Air Conditioner is Turned On?

1 Answers
VonRachel
07/30/25 9:55am
Car air conditioner abnormal noises are generally caused by internal or external issues within the air conditioning system. Internal noises typically occur when there is air or moisture in the refrigerant, leading to abnormal sounds during refrigerant evaporation and expansion, which users perceive as coming from inside the dashboard. External noises are usually due to issues with the air conditioner compressor, where the sound can be heard near the compressor. Below are other possible causes of abnormal noises in car air conditioners: 1. Contaminants in the refrigerant: The noise is often caused by air or moisture mixed into the refrigerant. 2. Damaged internal structure of the compressor: If the noise persists after refrigerant recharge and is located near the compressor, there is a high probability of internal mechanical damage to the compressor. If the noise recurs after some time and originates from inside the dashboard, it is likely due to reduced efficiency of the dryer. The noise heard after starting the air conditioner is primarily the operational noise of the compressor and does not indicate a fault.
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