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Water is leaking in my rear floorboard. I see it coming down the post behind the door when it rains, when I pull up the plastic cover. Is it the rear 1/4 window,roof rack, or body weld? Is this in all BIIs or is it just mine?

I would say that this is not common based upon the experience with numerous BIIs, however my '89's drivers seat belt (in the post) would get wet when it rained alot. This was attributed to the sunroof. But if it rained more than a lot, the driver's rear floorboard (carpet) would be wet. If you don't have the sunroof, (my drains were plugged) and I were a betting kinda guy, I would say that your problem would be the rear window seal. Unfortunately there is not clear way to tell without removing the interior side panel.

Let us know what you find.

yea you will have drain hoses coming down each pillar from the sun roof
mine leaks really bad but thats because i took a 7in zip cut tot th roof and chop topped it

hey mine leaks from the rear right window and i ripped my carpets out and sprayed on a liner from duplicolor it looks great and help it alot i unplugged my drains there great it holds when i plug em but you can a window sealant or silicon lol