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mine leaks water like crazy...it seeps in around the windshield seal.....


that would be my guess.
the roof gutter empties tight on top of the windshield seal.
might be wet fabric/liner on the A pillar

or down at the bottom corners, and will be visible drops on inside near glass


after cleanin these areas get some black adhesive sealant- not 100% silicone ! - and fill the holes.

remember that just one tiny little hole in the right place can flood the floor board.

for best results, start with the most likely areas and see what happens.

1989 5 door montero 3.0 auto
stock original Japanese
about 200k miles