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Originally Posted by X5girl
...Even when ignition is switched off and key removed, it sounds as if my interior fan is still running on slow speed...
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I had this exact problem. Replace your final stage resistor.
Even though some (all?) of the threads on this do not talk about a bad FSR running the fans while the car is off, that was in fact exactly what was happening to me:
http://www.xoutpost.com/x5-e53-forum/...r-car-off.html
Let us know how it goes.