Throughout the year's I have found that the grease in the window motor will get into the armachure.. What I have found out it is best to us a window motor from a mid 80's 2 door full size car.. The armachure has less winding so it will turn faster.. If replacing them is not an option I would remove the motor take it apart and clean the grease from the armachure.. This is the case with most windows that fail to work....
