Cooling fan running after car turned off. For the first time since I bought my A4 in November 2016, the cooling fan ran on high speed for about 5 minutes after I turned off the car today. I have never heard it running before today. I believe it had been running on high speed for some time, since I heard some unusual noise while driving.. 1. Coolant Fan Running. Many cars are designed so the coolant fan can run a bit after the engine turns off. This helps cool down the engine faster and maintain optimal engine temperature. If the fan bearings are worn out or the fan motor is failing, it can cause a whirring noise. 2.

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nullptr said: It's fairly common for the fan to continue to run after the engine is turned off so it continues to draw air through the radiator and over the engine. I wouldn't worry about it unless it runs for hours. Dash temperature gauges aren't particularly accurate for more than, "Oh crap, it's overheating!". The fan making noise after the engine is turned off is a common occurrence and is typically part of the vehicle's cool-down process. This happens when the engine has been running hotter than normal, and the fan continues to operate until the temperature sensor registers a cooler temperature. When the engine runs, it heats up, and even when it.