I have a 99 TJ sport, me and dad drove it down to myrtle beach this weekend, and while we were driving and my dad was sitting in the passenger seat, he felt drops of water dropping on his feet. Thought it might have been condensation from ac. I got home, and washed it, then when I vaccumed it I noticed a good amount of water in the passenger floor. and this wasn't there before I washed it. Hard top was on the whole trip and was not leaking, so it's coming somewhere under/behind glovebox firewall area. in ideas what it could be?
Heater core leaking coolant? Thats what happened to me. Always leaked from right behind glovebox were heater core is located on firewall. Im not saying thats ur problem what i has this problem n thats my best guess.
I'd start by checking the drain tubes for your cowl and ac unit. If the ac drain gets clogged up with junk the condensation backs up and drains on the floor. Same with the cowl drain, rainwater (or wash water) will run into the dash if they're clogged. The ac drain should be a short tube sticking out of the firewall under the battery. The cowl drains I'm not sure about (i have a yj), I think there are two tubes about an inch diameter that should come out of the firewall and point down about a foot and have a pinched end pointing to the ground. Just pull them off and clean them out if they're clogged up. Hopefully someone else will chime in to verify the location.
If the A/C system is similar to the cherokees, then your 'drain' for the A/C is plugged.
Pull back the carpet on the passenger side, and look about in the middle of the firewall floorpan-see if there is a 'fitting' of some sort there. Might be a plastic plug, might be a small bolt. Be prepared to get a LOT of water coming out when you remove this-have a bowl or something handy! If you open it up and get flooded-then yup...you have a plugged drain line. Get a couple feet of heavy copper wire or similar and feed it into the hole as far as you can go. If you run into gunk, leaves, whatever try to get them out with needle nose pliers.
If you do NOT have this drain plug, then look under the jeep, up the firewall in the same area for a rubber hose sticking out of the firewall-that would be your drain. Try fishing a wire up this lose and see if it's clogged with gunk.
I have a 99 also, and it does a similar if not the same thing. My A/C drain is not plugged though it drains well, and for awhile even once I turn the motor off.
At highway speeds it leaks more into the cab. As water drains out of the tube the air pushes the water through the bottom side of my seal that is in the firewall. I have no carpet so can see exactly where it was coming in from on the bottom side of that seal. I just bought my jeep a couple weeks ago and drove it home 12 hours with the a/c on high and it was real humid. When I stopped for gas half way home it had a half inch of water on the passenger floor board.
I just took silicone tonight and put it all around the bottom and sides of that sponge type seal that is in the firewall on the inside and outside of the cab. I'm pretty sure this will fix mine.
Try this, I had the same problem and the dealer wanted $800.00 to fix it. I fixed it for $1.98 AC Condensation Leak
Great write up, I had the same exact problem on my 02. Did the exact same thing, purchased the tubing and a hose clamp from ace hardware. Leak free for over 8 months now. Sounds like your having the same problem.