You should inspect the liftgate window for proper fit to the liftgate window weatherstrip, and open and close the liftgate window, if the liftgate window is hard to close, additional striker shims will need to be added, if the liftgate window does not seal tightly against the weatherstrip, striker shims will need to be removed, open the liftgate window and loosen the nuts retaining the liftgate striker to the liftgate window.
By BobGM Specialist
01/11/2022