A creak or squeak can be heard from the top of the front or rear doors. This noise is most noticeable when the windows are fully up. The noise is caused by the decay of the flocking material on the door seals. New door seals, Teflon tape, special lube, or a combination of all of these may be needed to eliminate the noise.
Noise From Top of Front/Rear Doors When Windows Are Fully Up on BMW 323i
4 people reported this problem
WHISTLING/ SQUEALING SOUND FROM WINDOWS WHEN THEY ARE RAISED TO COMPLETION
2000 BMW 323i 80,000 mi, Visitor
I am also having this problem, but I could not figure out where the noise was coming from, thanks!