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Why does the Audi Q7's electric fan keep running?

3 Answers

DiNevaeh

09/05/25 4:00am

Electric fan keeps running due to circuit malfunction. The car's electric fan is controlled by a thermostat, designed to prevent the engine coolant temperature from getting too high. Components of a car's electric fan: The electric fan consists of sensors, the fan itself, chips, etc. When the coolant temperature exceeds 90 degrees, the sensor activates, turning on the electric fan to lower the temperature. Once the temperature drops below the lower threshold, the thermostat cuts power and the fan stops. Electric fan replacement method: First open the car's hood, remove the intake pipe above the fan to allow easy fan removal. Install the new fan correctly on its bracket, tighten it, and secure the four corner screws.

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VonPenelope

09/17/25 4:33am

As a mechanic with 15 years of experience running an auto repair shop, let me talk about the Audi Q7's fan running non-stop. Last week, I fixed the same model with its fan spinning like a helicopter. There are three common causes: First, issues with the cooling system—like a radiator clogged with willow catkins, low coolant, or a stuck thermostat—can prevent the engine from cooling down, forcing the fan to work overtime. Second, electrical system problems, such as a coolant temperature sensor giving false readings (reporting high temps when it's normal) or a fan relay that's stuck, can keep the fan running endlessly. Third, excessive AC pressure, especially from overcharged refrigerant or a dirty condenser, can also make the fan work relentlessly. I suggest checking the temperature difference between the radiator's upper and lower hoses first—if one is hot and the other cold, it's likely a thermostat issue.

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VanMargaret

10/31/25 5:04am

My Q7 also had the issue of the fan running non-stop last year, and after some troubleshooting, it turned out to be a faulty AC pressure switch. Simply put, there are three main scenarios when the fan runs continuously: the engine is genuinely overheating due to cooling system failure; sensors or circuits sending incorrect signals; or issues with the cooling module itself. The first things to check are whether the coolant level is sufficient and if the radiator fins are clogged. It's normal for the fan to run for a few minutes after turning off the engine, but if it spins wildly right after a cold start, there's definitely a problem. I remember one time after changing the coolant, I forgot to bleed the system, and the fan ran the entire drive—re-bleeding the air solved the issue.

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