On mine.....remove the side pillar trim panel (4 screws), the top rubber trim just snaps in a plastic channel that is glued??? in to the WS metal frame. the channel does not extend all the way to the sides, a few inches shy. And then 1 screw (behind the side pillar panels) to hold the top trim seal ends in location. If the plastic U channel becomes unfastened, the rubber seal wont stay snug against WS. I filled the gap behind the seal with an urethane window adhesive purchased from my local autoglass shop, and reinstalled the seal for a watertight seal. That also kept the seal in place as the plastic channel on mine was loose in a couple of spots, and no way to reattach.
2001 Brave 29SE, 7.4L Workhorse P32