Water leaking into the cabin can have several points of entry:
Around the front or rear windshield (if they were ever replaced)
From a clogged sunroof drain (very common)
Failed vapor barrier inside the door panel (also very common)
Leaking heater core (feel the carpeting under the dashboard....if it`s damp/wet, that`s your suspect)
The road goes ever onward....
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When faced with choosing between two evils, always go with the one you`ve never tried before....