1999 gran prix, drivers window, new motor, new switch, window goes down fine, has a real hard time going up.
make sure its not binding between the tracks... that's what it sounds like its doing...
Sometimes when the rubber weather stripping gets old, it can get in the way when rolling up the window. Check the weather stripping around the window to see if it has cracks in it or is misaligned.
You might try lubricating the tracks with spray silicone. If that works for you buy some stick silicone and apply it like "chap stick" to the tracks, this will give you a longer term remedy to the problem.
Looking for a Used Grand Prix in your area?
CarGurus has 2,639 nationwide Grand Prix listings starting at $1,449.
Search Pontiac Grand Prix Questions
Pontiac Grand Prix Experts