I have a 96 1500.
I've pulled away the carpet and rubber padding that goes up behind the dash.
Right where the AC tray collection area goes throught the firewall, there is
a little trickle of water flowing down.
I imagine that I can get some silicone and seal it up and it will stop?
A little water is still coming out the drain tube on the engine side of the
There is also cold air coming out the tube as well.
What I found on mine was the seal between the firewall and the "A/C box" had
fallen apart allowing condensation to trickle back in along the drain tube.
I loosened the box mounts(under hood) then put a wedge inside to pull it
away from the fire wall. I then cleaned the factory seal off and built up a
bead of RTV around the tube. removed the wedge and tightened the mounts. I
then took a 3/4 in hose and attached it to the tube and plumed it down along
the frame. let the RTV cure overnight and the leak was gone. about $5 and 3
hours in the garage.
I think that's what I will have to do too. I was able to pull away the
carpet and rubber matt and could see where the water was trickling down.
I'm going to have to figure out how to loosen the thing so I can clean it
and get some sort of sealant in there.
Thanks for the insight.
I was talking to my brother who had spoken to his buddy who's a mechanic and
said that something that would work would be 3M's 'windo-weld'. I think
it's used to set and seal windows. Comes in rope like package.
As has been posted, probably a clogged drain tube. However, if
un-clogging the drain tube does not remedy the problem, re-examine the
fluid inside the cab. Is it water (condensation) or is it radiator
fluid (water/anti-freeze). If radiator fluid, you may have a bad
Thanks for everyones responses.
The main culprit here was a foam like gasket that had rotted away. This
gasket was between the bottom of the ac, where the water collects and then
goes throught the firewall with a tube, and the firewall.
The tube was too short, (story of my life...) and the water would run out to
the end of the tube and some of it would drip down as intended, but most
would come back on the outside bottom of the tube and through the gasket
into the cab and onto the floor.
The thing that fixed it was putting a two to two and a half foot section of
5/8" rubber heater hose on the tube with a hose clamp and then run it down
near the swing arm.
I also put some 3M window weld around and between the ac and the firewall
where it goes through, just for good measure. Although I don't think
there's much chance of water getting back in there anymore.
This had been going on for about three years now..... I had one of those
Homer Simpson "Doh!" moments after realizing how simple a fix this was...
Hope this helps somebody out there!
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.