WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.
Open the endgate or the liftgate.
Remove the weatherstrip molding from the pinch-weld flange.
Firmly grip the weatherstrip.
Pull the weatherstrip out and away from the vehicle.