The AC evaporator drain commonly clogs and causes water to leak onto the passenger side floor. A sloshing noise may also be heard from the water inside the heater housing. Decaying organic debris in the housing may cause an odor. A service bulletin (TSB 24-06-96) was released; it describes how to clean the drain tube without removing the heater AC housing.
Car Problem Reports
Jeep Grand Cherokee Water Leak and Sloshing Due to Clogged Evaporator Drain
Jeep Grand Cherokee Problem
Average Mileage: 142,500 mi (75,000 mi - 202,000 mi)
Visitor, 1995 Jeep Grand Cherokee, 153,000 mi
Water leaking on to passenger floor. Particularly noticeable during a hard rain
Visitor, 1993 Jeep Grand Cherokee, 75,000 mi
my air cond, leaks in pastenger floor, how do I fix this
Visitor, 1996 Jeep Grand Cherokee, 125,000 mi
same wet floor
Wet carpet on passenger side. Carpet was peeled away to reveal trouble spot, debris was removed and has been several times every 20k miles or so.
Visitor, 1995 Jeep Grand Cherokee, 202,000 mi
We noticed puddles of water on the floor on the passenger's side. The shop said the evaporator drain was plugged and fixed it.