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What Causes Moisture at Car Air Conditioning Vents?

1 Answers

LaClaire

07/30/25 10:18am

This is because there is moisture in the car air conditioning refrigerant. When this happens, the refrigerant in the air conditioning system needs to be completely extracted and replaced with new refrigerant. Car air conditioning relies on refrigerant for cooling, and the refrigerant used in car air conditioning is R134a. Here are some additional details: 1. When the car air conditioning is in cooling mode, the compressor clutch engages, and the engine drives the compressor to operate. During operation, the compressor continuously compresses the refrigerant and delivers it to the evaporator. Inside the evaporator, the refrigerant expands and absorbs heat, cooling the evaporator. The cooled evaporator then cools the air blown by the blower, allowing the car air conditioning vents to blow cold air. 2. When the car air conditioning is in heating mode, the high-temperature coolant from the engine flows through the heater core. The air blown by the blower also passes through the heater core, allowing the car air conditioning vents to blow warm air. The car air conditioning system requires regular refrigerant top-ups. If refrigerant is not added for a long time, the cooling speed of the air conditioning will slow down, and the cooling effect will deteriorate.

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