Water Leak from Cowl Area - JeepForum.com
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post #1 of 13 Old 03-14-2019, 10:18 PM Thread Starter
BHedlund1989
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Water Leak from Cowl Area

Has anyone had luck fixing a water leak from the passenger side of the cowl. I spent a few hours last week diagnosing where the water was coming from and whenever I pour water on the passenger side of the windshield cowl area I can watch water trickle down near the A-pillar. I've tried the search option and am getting all sorts of different answers. I already re-siliconed around the antenna area and that didn't help. I'm at the point of extreme frustration with this and am looking for suggestions to help fix this issue.


2000 WJ Laredo
IRO 3" on 265/75/16 JK takeoffs
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post #2 of 13 Old 03-14-2019, 10:33 PM
2oldjeeps
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where exactly inside, firewall to floor or kick panel on right side?
my xj was hard to fix,leak around air intake but not sure yet on wj.ill check my 99

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post #3 of 13 Old 03-14-2019, 10:34 PM
2oldjeeps
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!!wow, quiet nite huh

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post #4 of 13 Old 03-15-2019, 07:38 AM
99sajeep
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If the water is in fact coming down the A-pillar (and not the firewall), then my best guess is you have a body seam leak. This will probably require pulling the fender off and looking at all the frame panel seams.

The caulk/joint sealants used will get old and brittle and will sometimes allow water to come in.

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post #5 of 13 Old 03-15-2019, 08:08 AM
jserna
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Mine was doing the same thing but on the driver side. The issue was the windshield gasket. It was coming loose and allowing the water to enter. I tried the windshield sealant, but it did not fix it so I had the windshield removed and reinstalled with a new rubber gasket and sealant. No more leaks.
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post #6 of 13 Old 03-15-2019, 12:06 PM
speedo1
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Mine also, drivers side. Open hood, in the back corner under cowl, water will leak in, dribble down inside kick panel. Need to re-caulk back corner.
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post #7 of 13 Old 03-15-2019, 10:51 PM Thread Starter
BHedlund1989
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To me it seems almost as if it's a body seam leak unfortunately. When i pulled the cowl and poured water into the opening where the fender and cowl meet water enters the vehicle. I also undercoated the body seam in the wheel well opening because it seemed a bit of water would enter as well when I sprayed water into the wheel well. I just wonder how much success I would have pulling the fender and hopefully finding where it seems the water is entering in through the fire wall.

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post #8 of 13 Old 03-16-2019, 06:39 AM
GarDav25
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I originally thought it was my heater core. Took the dash out and found very small beginning of a leak.

I noticed that the "blue" plastic tubing that runs down the a-pillar from the sun roof to the floor was broken in several places, very fragile, because it is a cheap material. I guess the southern heat overwhelmed it.

I installed new drain tubing for both the left and right side front sunroof drains. No more water for now!
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post #9 of 13 Old 03-16-2019, 11:09 AM
2oldjeeps
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an earlier post? said pulling the cowl and cleaning ? some drain fixed it.? i say ? because i have not looked in there ,,,yet
dont know where that post is.

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post #10 of 13 Old 03-16-2019, 11:29 PM Thread Starter
BHedlund1989
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The leak isn't coming from the sunroof drains, heater core, or from the ac box. I'm beginning to think it's what 99sajeep believes it being old/deteriorated body seem caulk. I've double checked every drain to make sure its clear and not leaking water with the carpet peeled back and the only time water comes in is when pouring water underneath the cowl.

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post #11 of 13 Old 03-18-2019, 07:53 AM
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@BHedlund1989 ,
Pulling the fender isn't too hard, but I'd take a small metal pick (with sharp point) and scribe around all of the bolts/washers that hold the fender on. This will help in getting everything lined back up again. You don't want to have clearance issues afterwards and then mess up the paint while opening the door... As for the caulk joints, just look for anything that looks like a hairline crack and seal it up. Hell, cover all the joints just to be sure!

If it was me, I would not use anything that can be bought at a home improvement store; ie: no bathroom caulk, silicone, etc. Autozone carries some stuff called 3M Windo-Weld. It's a black, urethane sealant used to glue in windshields. It's about $30/tube, but that stuff works! It is messy though so grab some acetone for clean-up.

FWIW, when my WK was leaking it was coming from the windshield. Top corner of the driver's side. The sealant used to glue the windshield in had a gap (or two). I used that 3M stuff and completely sealed around my windshield No more leaks. Of course, whomever draws the short-stick and has to replace my windshield is gonna hate me!
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'05 WK 4x4 Ltd 5.7L (mine) 200k+ club
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post #12 of 13 Old 03-18-2019, 10:30 AM Thread Starter
BHedlund1989
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Quote:
Originally Posted by 99sajeep View Post
@BHedlund1989 ,
Pulling the fender isn't too hard, but I'd take a small metal pick (with sharp point) and scribe around all of the bolts/washers that hold the fender on. This will help in getting everything lined back up again. You don't want to have clearance issues afterwards and then mess up the paint while opening the door... As for the caulk joints, just look for anything that looks like a hairline crack and seal it up. Hell, cover all the joints just to be sure!

If it was me, I would not use anything that can be bought at a home improvement store; ie: no bathroom caulk, silicone, etc. Autozone carries some stuff called 3M Windo-Weld. It's a black, urethane sealant used to glue in windshields. It's about $30/tube, but that stuff works! It is messy though so grab some acetone for clean-up.

FWIW, when my WK was leaking it was coming from the windshield. Top corner of the driver's side. The sealant used to glue the windshield in had a gap (or two). I used that 3M stuff and completely sealed around my windshield No more leaks. Of course, whomever draws the short-stick and has to replace my windshield is gonna hate me!

yea luckily I have a little bodyshop background so i'm not to worried about taking the fender off, it's just the time right now do to starting a new career this week and being extremely busy with it.

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post #13 of 13 Old 03-18-2019, 10:50 AM
99sajeep
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I hear ya. Good luck with the new start!

'99 WJ 4x4 Ltd 4.7L (sold)
'05 WK 4x4 Ltd 5.7L (mine) 200k+ club
'01 WJ 4x4 Laredo 4.7L (daughter)
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