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AnswerThe simple answer would be that the electric fans that cool the radiator are still running and will turn off automatically when the temp goes down enough. It sounds like a gentle whirring noise. I am not a BMW afficianado, so other then that I don't have a general answer.

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Well, on an E-36 that simple answer is not correct. I've never encountered any of my engine cooling system componets running after shut down. However, I have a 97 328i that has this dinky little fan that sucks air through a temp sensor that tells the car what temperature the interior is currently at. This small fan runs for a few minutes after you shut off the car. Though this may tell you what that little electric whirring sound is that your BMW is making after you shut down the car, I don't have the explanation of why they do this. Seems like a waste of battery to me.

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Q: Why is a BMW making noise when I shut the engine off?
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