heater fan noise on 1999 BMW 328i

How do I fix heater fan noise?

Asked by for the 1999 BMW 328i
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.