About three years ago, water started appearing in the trunk of my 1995 Grand AM. I got into the trunk and had a second party hose water over the entire rear area of the auto. No indication of water coming into the trunk.
I inserted a thin 0.15" "feeler" between the seal and the trunk, and moved it the total 360 degrees, the feeler felt snug as it traveled the path.
I got under the car and could not see any problem beneath the trunk. No problems.
This problem remains a mystery, any resolutions or wild guesses will be appreciated.
R. Maniag, Houston, Texas