I just went thru this on a 2002 s-blazer. Thier is a access hole behind the carpet on the rear inner gate panel. If you peel the center top of the carpet down you will see a small punch out behind the carpet. The punch out is about 3/8 of a inch high and about a inch long. If you punch this out you will see a gold colored lever insid the access hole, you can stick a screwdriver in their and slide it toward the passsenger side of the vehicle, this should release the gate glass. Good luck,Techboy23