Q: Loud pitchy noise

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For the past year my BMW X3 suv deals with this loud pitchy noise that comes up at times when I'm driving. The strange part about it is that no light shows up on the dashboard indicating where problem is coming from but as soon I turn the car off and I can literally hear the noise slowly diminish and go away(almost like air coming out) . When I start it back up the noise is gone.

My car has 15800 miles.
My car has an automatic transmission.

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