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Radiator Fan Running extremely fast but car is not overheating. on 2006 Audi A3

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My Radiator fan switches on when the car gets to the 90 degree mark (running Temp) and then stays on, even with normal driving and not racing it. It stays on for approximately 5 Min after I switch the car off. But it is running extremely fast. Could this be a faulty sensor or is it a sign that I need to change my water pump? Need to know as my car is coming up on its service time and need to budget for the worst.
(1) Answer
Hello,
Audi and VW cars in the mid-late 2000's use an electric water pump to cool the engine and turbo after the engine shuts down. The fan runs for a moment when the engine shuts down as well, especially if the engine is hot.

The fan should not need to run at normal operating temperature, unless the vehicle is sitting still. Since it does, you likely have issues in your cooling system, but your turbocharger could also be overheating due to a lean air/fuel mix.

When was the last time the cam follower for the high pressure fuel pump was inspected? Do you have a loss of power?

Do you have a check engine light on for misfires? P0300?