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What causes the Passat Lingyu fan to keep running?

2 Answers

Ibarra

07/28/25 6:40pm

The reasons why the Passat Lingyu fan keeps running include insufficient coolant, radiator leakage, thermostat failure, etc. Insufficient coolant: Engine overheating caused by insufficient coolant leads to continuous operation of the electric fan; adding antifreeze can solve the issue. Radiator leakage: Engine overheating due to radiator leakage, caused by loose or damaged hoses, results in continuous operation of the electric fan; replace or repair the radiator. Thermostat failure: Due to thermostat issues, the temperature reaches the baseline but fails to send water to the radiator, or the water flow is insufficient, causing engine overheating and continuous operation of the electric fan. Replacing the thermostat can resolve the problem.

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EmmanuelDella

08/12/25 12:11am

After driving for so many years, I've seen quite a few cases where the fan keeps running. One common reason is a faulty coolant temperature sensor, which misjudges the engine temperature as too high, causing the fan to run continuously. Another possibility is a stuck relay, especially in older models like the Passat Lingyu, where oxidized relay contacts fail to break the circuit. Additionally, when the air conditioning system is operating, the fan will run in coordination. If the AC switch isn't properly turned off or is malfunctioning, the fan won't stop. I must remind you that a continuously running fan not only drains the battery but also accelerates wear on the fan motor, eventually leading to major repairs. I recommend first checking the coolant level—if it's low, the system may malfunction. Then, use a diagnostic tool to scan for trouble codes. If you don't have professional tools, it's best to visit a 4S shop and have a technician test the sensor's resistance. Don't delay, as a breakdown on the road would be even more troublesome. I've dealt with similar issues myself, and addressing them promptly saves a lot of hassle.

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