Interior water leak - Ford Powerstroke Diesel Forum
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Old 04-25-2013, 08:11 PM
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Interior water leak

Hi, guys this is only my 2nd post but ive been an advid visitor to the site over the years.

Here's my issue. Ive just developed a water leak on my truck its a 99.5 f350 CC drw. I started seeing a ton of water on the passenger front floor board (rubber floor). I pulled up the door sills (front and back) and there was about an inch of water under the sill area. The sound deadener was soaked and sopping wet. I did a hose test going over the vehicle until I found the leak. The major leak ended up being the door vent valve (that nice valve behind the rear seat that lets air out when you shut the door to help depressurize the cabin). I replaced that and that has helped pretty much seal up the major leak that developed. One of the flaps on the oem valve had gotten dry rotted open and when it rained it was pouring into the cab down the rear wall and into the passenger side door sill. Now it doesnt leak in back but im having a small leak when it rains up front. I have noticed that when it rains that the vaccum acuator that control the vent on the blower motor box seems to have water on it. The rod that is attached and goes above it appears to be wet as well. Im just trying to narrow down where this leak is before I go pulling apart the dash and pulling out the blower motor and squirel cage.

Is it possible that water could be coming in from the cowl area where the intake for fresh air is? Then as it enters the intake its coming out the vent door and onto the floor? If i turn the air or heat on it doesnt blow out but if I make a somewhat hard stop or a corner it seems to come running down on the floor. ITs around a few ounces per rain storm. Its not the heater core as it is water and not antifreeze I already checked that as well. Really want to get this fixed since theres no rust on the truck and I want to keep it that way.

If theres any other common areas for leaks up near the passenger firewall area please give me some insite.

Thanks Alex.
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Old 04-29-2013, 01:26 PM
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I MAY be able to offer a little assistance. I chased the front leak you describe. I first made sure the condensate drain under the truck was clear of any obstruction. It did not have a hose like I expected, only a molded hole in the plastic. Then i removed the plastic cowling from the truck. I ensured there was not a breach in the sealant around the fresh air intake. I don't believe there was but that area got plenty of silicone before I buttoned it back up. Additionally, I siliconed the exterior and interior of the "air box" , from under the hood, at it's seam as well as I could. It took some reaching to get the silicone spread around. I determined with a water hose that if water was allowed to get on top of that air box that it was pouring in to interior at the squirrel cage area I believe. All in all I believe I fixed it and I believe it was the horizontal seam that was leaking. Good luck
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Old 04-29-2013, 02:43 PM
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How did you change the rear cab vents? Did you have to take the bed off? Mine leak. Fills up the cab corners.
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Old 05-25-2013, 04:49 PM
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It took some time to get it in, getting the oem one out was easy push out and it dropped to the ground getting the new one in took some pushing and squeezing
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