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Cabin Water Leak
#1
Thought we had this tackled some time ago. There is water on the passenger floor after a rain. We had previously patched some obvious holes in the body just in front of the windshield on the passenger side. We used JB Weld and strips of metal foil. Now, after a freak storm, there is water on the floor. Not a lot, maybe a quarter cup, and this storm dumped an inch an hour. When the water runs off the windshield, where is it supposed to go? Is there a drain hole I am not finding that may be plugged? While working on fixing up this Mustang, a water leak in the cabin has been one of the most difficult problems to pin down.

mike

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#2
In the cowl in front of the windshield there is a "hat" that sticks up to let air in; but it is a common area to rust and let water in. Remove the two plastic grills in front of the wiper arms and take a flashlight and look into the opening towards the passenger side. Search for cowl repair here on the site to get some tips.



Mike AKA Ole Pony & Rare Pony

Our current Mustang garage/driveway
1973 Mustang Convert - Bought in 1974 - Still have it!
2004 Mach 1 Oxford White Auto, Bought Sept 06


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#3
OLE PONY;28679 Wrote:In the cowl in front of the windshield there is a "hat" that sticks up to let air in; but it is a common area to rust and let water in. Remove the two plastic grills in front of the wiper arms and take a flashlight and look into the opening towards the passenger side. Search for cowl repair here on the site to get some tips.

Holes will even be easier to spot if you wait till dark (or darken your shop) and place a light under the dash inside the car and look into the opening from the outside. Thats how I spotted holes that were not visible at first glance because the light will protrude from the inside.

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Mike

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#4
Yes Mike, i have to agree with the other 2 Mikes (A LOT of Mikes in this thread man!)

The cowl area is a bad place in our cars, even the most well kept cars has some issues going on there... Not an easy fix with the car running either but first, as the guys said, try to diagnose if that is the problem... 90% of chances that is it but who knows...

If that´s the problem and you are willing to solve it doing the right body work, then look for Scott´s videos of how he repaired his cowl.. They are very informative and the will help you get familiar with the cowl shape inside. However, if you are using your car and you are not planning on dismanteled it right now to restore it or something, you can do something in order to stop the water leak...

A lot of guys use epoxy fillers or fiberglass components to cover the rust holes... I particulary don´t like that kind of solutions because they probably don´t stop the hole leak and you are adding some not too friendly components on rusted surfaces.. I dont know.. i prefer something else...

You can always cover the air entrance on the top of the cowl by fabricating a certain kind of "top" where the cowl grille actually is... You are going to loose ventilation in the cabin but that is a much more undoable thing and you can be sure, no more water is going to go inside the cowl again...

Well... hope it helps!!



Damián Cool

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#5
http://mustang.carnutguys.com/_Media/pass_cowl_med.jpeg
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#6
don29163;28766 Wrote:http://mustang.carnutguys.com/_Media/pass_cowl_med.jpeg

Well, at least that is an obvious leak Big Grin
My leak is not that easy. We changed all the seals on the heater system, bought a kit and did all the gaskets. Nope. There are a couple of small holes in the roof behind the right rear window and I thought maybe water was tracking along the roof molding because there are occasional drops of water on the passenger seat. All the door and window weather stripping has been replaced. We will repair the holes when we replace the vinyl top. We waited a couple of months before installing new carpet and thought we had the leak solved. New carpet is in and water on the floor Huh

mike

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#7
Holes will even be easier to spot if you wait till dark (or darken your shop) and place a light under the dash inside the car and look into the opening from the outside. Thats how I spotted holes that were not visible at first glance because the light will protrude from the inside.
[/quote]

Just tried that, first with a head lamp on the carpet aimed up and there was no light leakage from the cowl area in near darkness. Then tried a high intensity strobe with the same result. No light leak. So where is the water coming from shrug2 One thing I know for sure, we will fix it Big Grin

mike

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