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Unread 05-25-2009, 07:54 PM   #1
josh2010
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2003 TJ Wrangler 
 
Join Date: May 2009
Location: Alabama
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Water leak through Cowl Vent?

I've been having water leak into the passenger side floorboard from behind the dash. I think the problem is with the seal on the cowl vent.

Any advice on how to remedy?

P.S. It's a 2003 Sahara, 5 spd.

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Unread 05-25-2009, 08:09 PM   #2
JBD
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Are you sure it's not your heater core?
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Unread 05-25-2009, 08:23 PM   #3
josh2010
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I'm pretty sure it's coming in through the seal of that vent on the hood right in the middle.

Why do you say that? How could I check?
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Unread 05-26-2009, 05:11 AM   #4
mylt1
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do you have AC and are you running it? if so, the drain tube could be clogged. not sure where it is on the wranglers but on my truck and several others its on the pass side.
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Unread 05-26-2009, 11:27 AM   #5
josh2010
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It's not the A/C. We sprayed water on the jeep with a waterhose and found that it would start leaking when we sprayed it in the cowl vent.
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Unread 05-26-2009, 11:37 AM   #6
erickpl
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josh, where in Alabama are you?

I'm in Huntsville and can probably help ya if you're close.

I had a leak on mine but it WAS the heater core area. I sealed it up as shown below.



If you reach up under the passenger footwell, you'll feel the other side of that heater core. If the spongy gasket it wet, that is your leak.

You may also have a leak by the air intake for the cabin. Seal that up as well.



I still have a SLIGHT leak in mine, but I looked at my seal under my windshield and it looks like something is a bit crooked. I'll be lowering my windshield this evening hopefully and try to get that straightened out a bit as well.

This is the A/C tube extension that was mentioned. I know it wasn't your diagnosis, but it helps to have it shown so people know what it looks like.

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Unread 05-27-2009, 10:38 PM   #7
numchuck
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there is a black plastic "funnel assembly" bolted to the center of the firewall . . . water that gets into the vent intake is supposed to drain out here; but sometimes it gets clogged with leaves or pine needles . . . at the very bottom of this plastic piece is a flexible rubber boot . . . use your fingers or a screw driver, here, to dislodge any junk that may be stuck there
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Last edited by numchuck; 05-28-2009 at 06:36 AM..
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Unread 05-28-2009, 11:33 AM   #8
richla
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I had this problem, too. From what I hear, it's real common. If you search on "cowl", there is a cute step by step that someone put together, I found it real helpful, although now I can't seem to find it, but it consisted of removing your wipers, removing that "grate/screen" part of your hood that the wipers come through, and that will give you access to the drain.
I blew air down it from my shop vac, and that blew a lot of leaves and crap right out.
Good luck!
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Unread 03-15-2012, 09:35 PM   #9
larrivee7
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Quote:
Originally Posted by numchuck View Post
there is a black plastic "funnel assembly" bolted to the center of the firewall . . . water that gets into the vent intake is supposed to drain out here; but sometimes it gets clogged with leaves or pine needles . . . at the very bottom of this plastic piece is a flexible rubber boot . . . use your fingers or a screw driver, here, to dislodge any junk that may be stuck there
This is where my trouble lies I think. I had the cowl off last weekend and had my dad spray the Jeep. Mine looks okay where the intake is, that people have trouble with. I thought water was coming around from the heater core area, but when I laid upside down in the seat and stuck my head under the dash I could tell it was coming from up higher.

My funnel thing in the center is sitting a little cockeyed and has some play (more horizontal than up/down, but a little of both). Water seems to be getting around it and then down the firewall from there. Is it supposed to be "snapped" up into place? Or is there supposed to be something else on the top to direct the water in?

Here it is:





Under the hood, you can see it's getting around it.




Anybody that's dealt with this? Or who can see what yours looks like to compare?
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