The driver's door window on my '92 Grand Am is a little hard to roll up and down especially in cold weather. Got in there and put white grease on all the sliding parts and the sector gear on the regulator. Sprayed some greaseless lube on the window channels (inside the door). Not a whole lot of improvement. A little, but not up to my expectations.
Seems to me that there was mention of a service bulletin on this issue in a list of bulletins I read a long time ago. Does anyone recall if there was indeed a bulletin and what its contents were?