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Why is the car air conditioner not cooling but blowing hot air?

1 Answers

FinnLee

09/02/25 5:14am

The reasons why the car air conditioner is not cooling but blowing hot air are as follows: 1. Damaged air conditioner flap motor: The switch flap motor of the car air conditioner is damaged. The flap motor is the main switch of the air conditioner vents, so if it is damaged, it will block the cold air from coming out. In this case, only professional maintenance personnel can disassemble the dashboard for inspection and repair. 2. Need to add refrigerant: Generally, the loss of refrigerant is caused by leakage, which can be divided into fault leakage and normal leakage. Under normal circumstances, there is a slight leakage in the air conditioning pipeline or condenser, so the refrigerant basically needs to be refilled every two to three years. However, if the refrigerant has just been added and the situation improves, but after a while it stops cooling again, it indicates that there is a serious leakage of refrigerant in the car air conditioner, usually due to refrigerant leakage in the condenser. This requires professional leak detection and repair. 3. Expansion valve and throttle valve failure causing the air conditioner not to cool: Therefore, when the air conditioning compressor is damaged, it directly affects the expansion valve and throttle valve, causing them to malfunction and leading to the car air conditioner not cooling. 4. The desiccant in the dryer tank is oversaturated: There is a dryer tank in the car air conditioning refrigeration system, whose main task is to absorb moisture in the refrigerant to prevent excessive moisture in the refrigerant from reducing the cooling capacity. When the desiccant in the dryer tank is saturated, moisture can no longer be filtered out. When the refrigerant passes through the expansion valve throttle hole, due to the drop in pressure and temperature, the water in the refrigerant will freeze in the small hole, causing the refrigerant to flow unsmoothly, increasing resistance, or completely stopping the flow, resulting in the air conditioner not cooling.

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