I just posted this reply for someone else, so it's timely!
On my 1996 it was happening after a rain or going to a car wash. When I was driving, I would stop and hear this sloshing sound from the trunk. The trunk and tire well were okay. After further investigating, the water was inside the rocker panels and would overflow into the interior floors.
FIX: from under the car, where the rocker meets the floor panel and is spot welded together, locate a small opening between the seam where the two panels come together. Along that run, notice small openings between the panels and in-between the spot welds. Take a wire coat hanger and stick it through between the two panels and wriggle it around. It goes in on a slight angle in several places. Poke the holes out from back to front and do this occasionally to keep it clear. The drainage system goes from the base of the top, and through the rockers by design. Keep 'em clear and it won't rust out either!
Monday, November 30th, 2009 AT 4:35 PM