October 15, 2011So I`m pulling some things out of the truck and notice the floormat and carpet is wet After some quick disassembly the entire passenger side carpet is soaked all the way thru the padding and there`s close to an inch of standing WARM water under it. It hasn`t rained here in over a week, so I`m thinking heater core, does that sound about right?
October 15, 2011Yep!!!Nasty job you`ll need extra hands..
October 16, 2011Yep,you would be right !!And it`s a lousy tasting smell that Antifreeze !!
October 16, 2011id replace the A/C evaporator as well since you have the dash apart...you wont have to do it twice.
October 16, 2011Did it smell like antifreeze? If not it`s probably the gasket on the third brake light. Faked me out on two of my Rams, neighbor had the same problem.
Always seems to go to the passenger side.
November 21, 2011Most likely heater core.
OR, your A/C drain has become clogged and is backing up and that`s just where it happens to be draining to
November 22, 2011It it`s antifreeze, it`s the heater core. IF it`s water, it could be anything letting water into the dry side of the plenum. If that was the case, yes... likely a/c drain clogged.
November 27, 2011Make sure the rubber tube for the A/C drain is there on the firewall. I had one rot and fall off that was the problem. Just water no antifreeze on the floor. Although heater cores are known to fail.
August 19, 2012I have the same problem with mine,seems to be the condesate drain from the a/c because it gets worse if I run the a/c alot
August 7, 2015SteveRT
The A/C drain on these trucks come straight out of the firewall and normal air flow while driving pushes the water back into your trucks floorboard. Had the same issue with mine so I installed a piece of 90 degree hose and sealed it on with silicone. I haven`t had a problem since.