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Our 1996 Civic LX was parked(outdoors)from August through late December of last year. The floor carpeting(front and rear)was wet/frozen when we returned. Checked all the door/window seals; cleaned out debris from overhead trees that had gathered by windshield wiper groove; stayed in car while it was being machine-washed; drove through rain-storms...no leaks. Are Civic-specific age related seal failure problems the cause? I put duct-tape along the windshield/rubber gasket(?) juncture. It seems to have helped somewhat, but has not completely stopped the wetness. Any ideas? I'm pretty sure that the wetness is "wicking" through the carpet from front to rear but have been unable to find any point-of-entry. Help!

 
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I'm not aware of any leaks up front at all but...go buy some flow able silicone. It can be found at most automotive parts places. Remove the duct tape and use a bead of that all the way around the windshield to see if that was the culprit. Any time the windshield gets replaced you have the possibility of introduced leaks. Hope that helps!

 
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since you have no moonroof, I do notice water in my car sometimes around the passenger side footwell. It might not be a top down problem, I think there might be a sealing issue near that kickpanel. I would run some water in that area, up into the wheel well and near the corner of the lower door.

Remove that kick panel and look to see if it wet behind there.

 
Rep Power: 298

Is this on the Driver or Pass side. The pass side has the A/C inlet under the trim behind the hood. Water from the window is trapped in that channel and drained in the fender. But if those are clogged it can funnel in to the AC opening and get in the car. It happed to a friends integra. Drove us nuts tracking down a leak to find out that was the problem.

 
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I had the same problem... Water on the pass side floor when it had rained.
It was due to a rust spot that had rusted through the firewall. Filled the hole with urethane foam and voila!

PM me and i'll post pictures if you want. It's a real easy fix.

EDIT: And don't do the "hose test". If your hole is where mine was, that will only result in water flowing through the firewall and directly onto your ECU. I had to change mine cause of that stupid leak. It was all corroded.

 
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What kind of urethane foam did you use? Have a pic?

 
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Nothing fancy. Something like this:
http://www.rona.ca/shop/~foam-triple...yurethane_shop

Probably not intended for that purpose, but it plugged up the hole real easy.

I'll get some pics in a few minutes.

 
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Okay, here goes.

-- Unlatch these clips at the bottom of the windshield. Do all of them.




Do so by using a flat, small screwdriver and slowly, gently lifting up the head of the clip. Dont break off the head !

 
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-- Next, open the hood and secure it using the stand. Use the lower hole, about five inches to the bottom and one inch to the left of the usual place where you insert the hood stand.

 
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Edit: useless step was here...

 
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-- Now, remove these clips. All of them. These gave me a hard time, unless I was doing it wrong. Anyway, longnose is your friend.

 
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-- Remove the two wipers using a ??mm wrench (I forget). Set wipers and holding bolts aside.

(I didn't actually take pics of this, but i'm sure you'll manage )

 
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-- Remove the plastic trim that is now freed, the one the sits at the bottom of the windshield.

Now, on the passenger side, look about here (of course, yours won't have the trim or the wipers anymore. I was just too lazy to do the whole thing again ).



You'll probably see corrosion. Yay! The culprit.

Directly underneath this hole is the ECU. Oh boy.

 
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-- I just plugged the whole thing with polyurethane foam. Some have plugged it by using sheet metal, welding it and whatnot. I didn't care that much.





Just make sure you don't cover up the factory drain hole, the one i point to in the last picture.
If you block this, water wont drain anymore. This hole leads to the wheel well, and water evacuates through this hole normally.

Voilą!
You're done.