Please DON'T RELY on seeing or feeling a "wet carpet" in the truck in order to determine IF the coolant tank is leaking! In my case the carpet was bone dry and the tank was still leaking (actually weeping from it's bottom when up to temp and pressurized).
The trunk in my 1998 has a masonite type of raised flooring that sits 1 inch above and between the metal trunk floor and the carpet....that allowed the coolant to collect below the masonite raised floor and just slosh around until it eventually found a way to drip a few drops on my garage floor.
I suggest you removed ALL the fabric lining in the rear trunk (bottom & sides)....(easy to do but time consuming). Then lift up the raised floor boards and drive the car for a day or two and just keep opening the truck to look for coolant collecting. I took rolled up paper towel and placed it all around the tanks sides and bottom, drove the car for a bit, and saw the paper towel began getting wet.
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