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Discussion Starter #21
I spent about 30 hours trying to solve this issue without any success. Ultimately saw a VERY small drip spot on the front corner of the firewall and made a catch bin( water bottle attached to the corner using self adhesive roofing laterial and body seam sealer to create a water tight seal from the body to the bottle with a drain hose that I pulled through the ebrake grommet/rubber seal on the floor. I didn't stop the leak but I gave the water a place to drain so my floor didn't get wet anymore. I used a common 12 ounce water bottle cut off about 4 ", drilled a hole in the cap, insert small line and seal.
I would start by cleaning out the cowling on the driver side and make sure you have proper drainage. Run a hose from below the windshield to try to figure out how high the leak is, gradually working your way up and go at it. I talked to a few body shops as well as leak repair specialists and they were not very hopeful of finding the leak in a cost effective way. i went as far as pull the fender and seam sealed a few spots but no luck.
 

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Did you ever diagnose the problem? I have a 2001 Honda Odyssey driver side floor wet as well. I pulled up the carpet and wet padding and still can't figure out where it's coming from.
One major suspect is as LeeRodgers suggests-
Look at the top of the van remove the black plastic strip on the drivers side that goes from luggage rack to the windshield. There I found a very small rust spot that was letting water in and running all the way down to the drivers
side floor under the carpet. Hope this helps you out.
The body seam along the roof. Either remove the roof rack and trim and do your entire driver side seam (or both sides!) or just the part in front of the rack (which means leave the rack in place, just remove the front trim). Clean out the seam, when dry reseal with suitable sealant.
 
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