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Found the leak(s). 1) slight trickle from badly replaced windscreen(lack of solastic) - not cause. 2) grommet missing from engine bulkhead, ac drain hose - also not cause. 3) Flat seal above door mirror, causing rain falling at particular angle to piss in like a tap - bingo! Hopefully a thin sliver ...

Hi Hope you can help. My 98 forester has been as watertight as a you-know-what throughout a wet QLD summer, but over this week(also a bit wet) has suddenly decided to collect 3inches of water in footwell behind passenger seat every night!?! What's going on? What could cause a sudden large leak like ...