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What is the situation when the car fan keeps running?

2 Answers

DiElla

08/31/25 6:09am

It may be due to a loose circuit connection. You can try unplugging the fan's wiring harness and performing a separate power-off treatment. Additionally, this situation could also be caused by a damaged water temperature sensor or a stuck fan relay contact. Simply replacing it with a new one at a repair shop will suffice. The water temperature in the radiator hasn't cooled down yet: The water temperature in the radiator decreases slowly. When the engine is just turned off, the water temperature hasn't dropped yet, so the cooling fan will continue to work for a while before stopping. If the car has completely cooled down and the fan is still running continuously, it indicates a fault in the cooling fan assembly or the cooling fan circuit, and timely repair is recommended. Thermostat failure: Due to the thermostat, the temperature reaches the baseline but cannot send water to the radiator, or the amount of water sent is too little, causing the engine to overheat and the electric fan to keep running.

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DeKylie

09/13/25 2:33am

It's quite common for the car fan to keep running non-stop. If it's the AC fan, the issue might be that the AC is set too low or the control button is stuck and hasn't reset. I've also encountered problems with the fan relay sticking in the on position and failing to turn off. Additionally, a faulty thermostat can cause the fan to run unnecessarily, especially during hot summer days. Checking is simple: turn off the engine and wait a few minutes; if the fan doesn't stop, then there's definitely a problem. If not addressed promptly, the battery can drain quickly, making it difficult to start the car the next morning. I've had this issue with my previous car, and replacing the relay fixed it. It's advisable to regularly inspect the fan system during maintenance to prevent serious problems that could affect driving safety.

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