Are you running the air conditioner? If the drain line is plugged, it will leak water (condensation) onto the passenger side floor.
Bad heater core? replace Evaporator drain plugged if A/C equipped - try to unplug from under vehicle
The air conditioneer drain is probably plugged. or the drain has been icked and is disconected from the pan so it is draining directly onto the floor
heater core may be leaking or hole in floor
There is a drain on the outside firewall that is clogged.
Is it blood, oil, water, or urine?
A/C condenser drain line is stopped up. This is allowing the water to enter the cabin. Crawl under the van and find the drain line. Usually located near the firewall passenger side. Clean out the drain tube.
you could have a heater core leaking or your windshield is leaking and the water is running down behind the dash and onto the floor.
Stopped up condenser drain line, unless this water is coolant. In that case it is a leaking heater core. Coolant tastes and smells sweet. Crawl under the car and look for a drain line on the passenger side, near the firewall. Clean this out with a blunt pencil.
bad heating core
Probably have a leak in the heater core>
Water on the passenger side floor would be a plugged up AC drain. The drain is located under the hood, at the lowest point on the HVAC box on the firewall. However if the floor is wet with engine coolant, the heater core is leaking.
Condensation from air conditioning?
Maybe a bad heater core
clogged drainage hole in the cowl (under the wipers)...
heater core leaking
If drainage is plugged under the grille adjacent to windshieldwipers, the water will drain into the floor of the front passenger seating area. Remove the grille and clear the plug. To avoid recurrence of this problem, clear leaves and other materials laying on the grille. Mike
this could be from the heater core. When the heater core goes out it leaks....right into the passenger side floor board If it is water, not coolant, the problem could be a plugged air conditioner drain. Easily accesible from under the hood.
If it is just water and not coolant, then more than likely the A/C drain line is plugged. Crawl under the car, passenger side, and find the drain line near the firewall and unclog it. If it is coolant then your heater core is leaking and needs replacing. Test the water and if it smells or taste sweet it is coolant.
when your heater core is shot it will leak on the passenger side of vehicle and your windshield will fog up most of the time
what kind of top do you have on the Jeep? If you have a sunroof, check the drains. They run on both sides of the sunroof down the door jams and go out of the floor boards.
because your heater core has a leak or the hose is broken
Water is leaking on passenger side floor board when heat is on
Check the front passenger floor pan toward the fire wall.