My money is on your 1992 having the original Volvo marked windshield.
A water test pretty much proved I had a leaking windshield which just happened to be dripping over the fuses on my 1992. The original windshield was replaced and the problem solved. I inspected the old windshield and body when it was removed and there was a small grit filled void in the butyl seal next to the glass. Probably a cold joint/automated start and end point in the caulking process aggravated by 20 years of slow motion shrinkage.
Don't bother trying to seal the rubber trim around the windshield. It is not designed to stop water from getting under it. You would have to get a large bead under the trim to stop the leak.
Tom
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