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What is the reason for the Volkswagen fan running continuously?

2 Answers

Vicki

07/25/25 4:27am

Under normal circumstances, after the vehicle is turned off, the engine cooling system continues to dissipate heat from the engine, so the fan will run for a period of time. In summer, especially after using the air conditioning, this duration may be longer. If the fan does not stop after an extended period, it is recommended to contact the local 4S dealership for inspection and repair. Detailed fault analysis for the Volkswagen Lavida fan running continuously: 1. Start the engine and let it idle: Check if the electric fan is not running, then turn off the ignition switch. Observe that the electric fan does not run, but approximately 1 minute later, the electric fan starts to operate at high speed. The fault is confirmed. 2. Fault code: Use the vehicle diagnostic tool VAS6150B with guided functions to check for faults. It is found that the engine control unit has one fault code P068-B00, which means: EMC/PCM power supply relay shutdown performance is too slow (J271 main relay).

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EverlyAnn

08/10/25 5:22pm

With over a decade of car repair experience, I've found that the most common reason for a Volkswagen fan running non-stop is an issue with the cooling system. Just the other day, I encountered a Touareg where a faulty coolant temperature sensor caused a false high-temperature reading, making the fan run at full speed. You should first check if the coolant level is sufficient—leaks or a clogged radiator can cause the engine temperature to falsely rise. Another small but important detail is a stuck thermostat, which prevents water circulation. The most dangerous scenario is when the electric fan itself short-circuits; once, upon disassembly, I found wiring damaged by rodent chewing. By the way, it's normal for the fan to run for a few minutes after turning off the engine, but if it exceeds ten minutes, there's definitely a problem. I recommend using a diagnostic tool to read the fault codes immediately and advise against tampering with the fan connector yourself—those large blades can break fingers if they start spinning.

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