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Q: heater fan noise on 1999 BMW 328i

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How do I fix heater fan noise?
(1) Answer
It is generally leaves that get in to the blower motor housing from the cowl vent being covered with leaves. You may need to remove the motor to clean out the debris, when your are doing so, make sure the motor armature is nice smooth when it rotates, a little WD-40 will help as well.