Now i know most of you are saying to yourself right now, dude its your heater core! But i really dont think so! I have a 2002 4 door 4x4 and my passenger side floor is usually always wet, i dont check it everytime but when i do its wet. The heater is usually the most common affect of a wet floor but im not losing any coolant, not does the plastic box around the heater core show any signs of a leak! what else could it be?

 

Do you have a sunroof?

 

no i dont

 

bad door/window seal?? have access to an air compressor and a buddy? get in the truck with the air hose, seal up the drivers side window(where you bring in the hose) and pressureize the cabin. have your friend spray a mix of soap and water on the door seams. if it bubbles, you have a leak there!!

 

Is it only wet when or after it rains? the above suggestions are good...I had a leak in the rear passenger side of my blazer...after about a year of trying to figure it out....ended up being a huge gap underneath the truck....filled it up with some caulk....dry as a cork....(I had even pulled up the carpet) I guess some more infor on when your truck leaks would be helpful...and maybe what it smells like? does it smell like antifreeze?

 

That what i was thinking because i know up at the roof where it bends into the A pillar the door seal is ****ty from when i went muddin! All the dirt and grim and **** got in there on both front doors and messed the seal up, But its only at the bend, no where else, and i didnt think it would make it all the way down to the floor, but you think thats what it really is? the drivers side floor isnt ever wet, that i notice anyway!

 

i have 2001 and when it rains it was leaking on 4wd control module under kick panel! passeneger side.caulked the gap under winshield on that side also there was some little gaps where fender meets the wheel well wheretire could spray into the openings used some roofing cement also let it run down right below the window a little, looked like there was gap there also. good luck

 

hehe...looked here assuming it was a heater core issue, just reminded myself of the lake of coolant on my passenger floorboard when it decided to explode. loads of fun!!!

 

Check your hinge pins, if the door is out of alignment then water can come through the seal at the window frame...when driving it will get past and into the cabin....one day when driving back home in a rain storm my girlfriend felt some thing wet and noticed water leaking into the passenger side, I have a bad hinge pin and the door is not really tight like it should be...need to replace it but the hole is eggshaped and the new brass bushing will only break like the old one ....so fixing it right now is not the ideal financial solution...looking for better setup to mod into the truck...