I have searched for this problem but none of the posts really had solution. My 08 quad cab has a lot of water on the front passenger floor. I could ring it out of the carpet and padding. It seems to be coming down from behind the grey stuff that covers the firewall. Does not smell like coolant. Has anyone had this issue? Is it a common issue on the 3rd gens ?

 

Hasn't happened to me, but just for some extra info: you say it didn't smell like coolant, do you think it is water? Did it happen after it rained? Is your truck covered?

Hopefully we'll get some others to chime in.

 

You'll most likely find that it's leaking at a body seam close to where you have everything wet, this is a pretty common problem, just not so easy to pinpoint. One way to start would be to use a garden hose and run water over the area above where you get the water and watch to see where it drips from.

 

Pretty sure it's water. Not sure how long it's been wet I have the moulded plastic mats I just happened to pull them out to sweep dog hair and found the water. Right now I'm just trying to get it to dry out. The truck is sitting out right now because the garage is blocked by the rv I just got. I am hoping it warms up alittle here so I can hit it with the hose. It has to be from the firewall area or above. The grey sound deadener on the firewall is soaked as well.

 

To dry the carpet and underlay, I take out all the bits of metal & plastic that hold it down & lift it up (I prop the carpet & underlay up until it's dry, otherwise it'll just mold the carpet & rust the floor). Then, you can see if there's any rust starting on the floor and use a small electric space heater (with a fan) to dry things out. Leave the doors or windows open to get the moisture out.

The leak could be on the window gasket or any body joint. I had a GM truck that had a leak just under the window, through one of the screw holes of a screw that held down the grill under the wipers. Check out anything that could even remotely be the problem. It doesn't take much of a leak to have the water accumulate in the carpet and underlay - under plastic mats, the water has no where to go.

 

I pulled the carpet up and soaked up the water with a couple of towels. Now I have the carpet held up with a piece of wood and it's starting to dry. Not sure what to do with the stuff on the firewall under the dash. It seems like a real pain to get out.

 

If you use a small space heater with a fan to blow warm air under the carpet, the water in the underlay against the firewall will migrate down, but it will take longer. In my GM pickup, I took the seat out and pulled the underlay off the clips (there weren't many of them) that held it to the firewall and then attacked it with the space heater. I dried mine at about this time of the year, and it took me a couple of days - this included fixing a couple of areas that were rusting.

 

Ok thanks for the input. Luckily not rust yet. Hope I can find the leak.

 

I had a similar problem. I posted this in another water leak thread.

On the passanger floor leak, the start of the thread, I had a similar problem. Raider posted something that I tried and it worked for me (it was not the AC). I took the wipers off and the plastic cowling off. When you do that you should see a couple "bumpers" that the windsheild rests on. I put silicone around these "bumpers" and put every thing back and let set for a day or so. I have not noticed the carpet being wet since.

 

I too have been battling this problem for some time. I have searched several forums and used Google to try and find a definitive cause and solution. I spent several hours yesterday trying a couple of leads. First was the infamous A/C condensate drain problem. I didn't think this was the problem, since my floor got wet when it rained or I took it to the car wash. The real possibility was that the condensate drain not only drained the condensate, but might possibly serve as a drain for water that entered the heater assembly thru an outside air intake. I searched high and low, tried from the top and bottom, never could actually find or see the drain. I could see under the blower housing where the drain exited the firewall. I removed the inner wheelwell liner (10 plastic rivets that must be "punched out" and ten pulled out) and then saw the small metal heat shield that required the removal of 2 nuts (11mm deep 1/4" drive socket). Once the shield is removed the oval or oblong hard plastic drain was visible. Using a mirror and light, I examined the tube and saw nothing obstructing the flow. I then used 1/4 nylon tubing (like ice-makers use) and cobbled up a connection to my shop vac, and attempted to suck any debris out - nothing was found or seen. Next, I hooked the same tubing up to a blow-gun nozzle and my air compressor and blew backwards - again nothing was noted or detected. I put it all back together, but the replacement rivets from Dodge were $6 each! I used the cheap "snap-type" from advanced auto for about $1 each. They are not as good and do not really pull the plastic panels tightly together, but they will work until I find a cheaper source for the good ones.

Next, I looked at the well-known upper brake light/cargo light area. Here I hit paydirt! 2 screws and the lamp assembly came right out. I then discovered the sealing gasket had been improperly installed since factory assembly. One end of the gasket was tucked inside the opening and left a significant gap for water and debris to enter. I made a new gasket, small bead of silicone on both sides, replaced all 3 bulbs (912 for cargo and 921 for brake) and put it together. We are supposed to have a good rain for the next couple of days, so we'll see whether the issue has been solved or even helped.

There are a bunch of pictures here in this album:
http://s1263.photobucket.com/user/19...?sort=3&page=1

Here is one that shows the mis-installed gasket:
21.jpg