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What Causes the Passat's Cooling Fan to Keep Running When Cold?

1 Answers

KiaraLee

07/30/25 1:19am

Passat's cooling fan may keep running when cold due to a faulty thermal switch, damaged fan relay, or defective air conditioning pressure switch. Working principle of the cooling fan: The cooling fan typically provides a noticeable temperature reduction of 4-15 degrees Celsius. After the temperature drops, air is rapidly exchanged, significantly improving air quality. When the cooling fan is activated, negative pressure is generated inside the cavity, drawing external air through high-efficiency evaporative cooling pads to lower the temperature. This transforms into cool fresh air that blows out from the air conditioning vents, with outlet temperatures reaching 5-15 degrees Celsius while consuming only 1 kilowatt-hour of electricity per hour. Function of the cooling fan: An automobile engine operating in high-temperature conditions must be properly cooled to maintain optimal working temperature, ensuring good engine performance, durability, and meeting exhaust emission requirements. The cooling system plays a crucial role in this process, primarily consisting of components such as the cooling fan, radiator, and thermostat.

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What to Do When a Motorcycle Won't Start After Sitting Too Long?

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