i've never done it on a liberty, but almost all new cars have door pannels that are affixed the same way. look for screws, like around the door handle and stuff. once you've got all the screws out, use something flat like a putty knife/gasket scraper along the bottom edge of the door pannel and pry between the metal door and the plastic interior pannel. door pannels are held in by a bunch of little plastic clips. go around the perimeter of the door until you've got the door pannel pulled away from the door and then disconnect the latch and any electrical stuff, like for power windows/locks, well just power locks if its a liberty door pannel. door pannels usually have a lip accross the top, like where the pannel meets up with the window, so watch out for that. not hard, just make sure you've got some new plastic "pop clips" to replace the ones you'll probably break pulling the door pannel off. they're sacrificial, to the jeep gods. if you don't replace them, your pannels will probably rattle like a b*tch.
2000 XJ silverstone metallic.
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