Buzzing sound from dash??
(91 750il E32) It seems as tho there is some sort of fan on in the cabin at ALL times. Its a very quite buzz/humm whenever the ignition is on. I pulled the climate control panel from the dash and found a small fan attached to the back that was very dirty. I was sure this was the source, after a good cleaning I replaced it and NOPE. It seems to be coming from higher in the dash and closer to the glass. There is no flow from any vents, just the noise.