Auto body repair & detailing: 2000 Cadillac DeVille REar Door Glass, power window regulator, pulley system

Question
Rear door glass stopped moving.  The drive motor runs on command of switch, but it does not 'drive the window up and down.'  (It can be moved up and down by hand)

Thank you

Answer
It needs a new power window regulator assembly, This is a common problem. You can get an aftermarket (non-GM) for about half the cost of a new GM part. There is no repairing the existing part, they have a goofy cable and pulley system that destroy themselves when the top pulley goes bad. They're poorly designed, and incredibly cheap qualiy Bill