if its just leaking in the hatch in general then thats a normal problem for these cars, i dont have that with my 92z but my girls 91 firebird gets about an inch of water in there after a big storm.she replaced the seal, sealed it with vasaline and even re aligned the hatch, it still leaks. iv heard then it may be leaking from where the deck meets the actual glass if it isnt sealed right.
so id check:
-if the weather stripping is dry ritted or has slits in it
-if the hatch is misaligned
-try folding the back seat and put a flashlight shining on the hatch from the inside with it closed and put a hose on the hatch to see if its leaking from where the glass meets the metal deck lid
you have to know where its leaking from before you fix it. i hope i helped at all, if you didnt find an answer try thirdgen.org good luck with it
-ken
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