This is not one of Jeep's better ideas. I have had to do several of these. The water drain on your cherokee actually empties through the floorboard into the frame rail. It is totally boxed in. You can't even see the thing from the engine compartment or from under the vehicle. It is impossible to get it unclogged without removing the evaporator housing.
I would totally agree 100% with Thundergod's solution on almost every vehicle made except the one we are talking about. Trust me, I looked for over an hour for the drain tube he is describing the first time I got one of these Cherokees in my shop. The drain dumps into the frame rail. (Or the uni-body equivalent af a frame rail) Under normal operation, when the drain is working properly, the water runs down the inside of the frame rail and drips out a hole in the rail located under the passenger seat. Unless you want to do something completely unorthodox like cutting a hole in the frame rail to gain access to the drain, the evaporator housing has to come out.
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Drain is even with the bottom of the heater box but on the engine side of the firewall on the passenger side (looks like a bent hose sticking out, not connected anywhere) Usually you can just roll it in your fingers and the water inside will push out the junk. Don't stick anything into it too far or you can punch a hole in something you need. I've actually gone as far as using a shop vac with a homemade adapter on the end to **** junk out on really bad ones.
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