What Causes Water Sounds in Car Air Conditioning?

[DiRiley]

During driving, you may encounter water sounds from the car air conditioning. Here are the detailed explanations: 1. Normal Cooling: The water sound in the air conditioning is the sound of refrigerant flowing, which is normal. If the cooling function works properly, there is no need to worry. This is because cooling relies on the continuous circulation of refrigerant (Freon), which undergoes a constant cycle of 'liquid—gas—liquid—gas' transformation to exchange heat and cold. The water sound you hear is the sound of liquid Freon flowing. 2. Occurrence After Shutdown: If the water sound appears after the air conditioning is turned off, it might indicate an issue with the air conditioning pipeline, such as a kinked or throttled section of the pipeline or poor heat exchange in the system. Problems like a dirty or blocked condenser, a dirty or blocked evaporator, or a clogged capillary tube can cause throttling sounds in the air conditioning.