SIMILAR PROBLEM, HERE WAS MY SOLUTION
ok, so I had the same problem just starting with my 1991 cherokee. clear, clean water had begun leaking on the passenger side floor pan though I hadn't been near any water lately. I had also noticed that my AC wasn't working well (inconsistent cooling and felt muggy in the cabin) though the system was fully charged and seemed to operate correctly. I had noticed as well that even on the hottest days that I never saw any water dripping on the ground from the drain AC tube and it made me wonder... so with a flashlight i peeked at the end of the hose and surprise surprise it was totally blocked. as i was messing with it it began to drip. I thought well, thats got to be it and as i was working with it all of the sudden released a huge gush of water on the ground, about a pint or more of water suddenly rushed out of the tube. I have yet to test it but, I believe that the drain was so backed up that the water was searching for an outlet and it found one on the passenger floor pan. I don't know how much water was backed up in there but, all the components must have been just swimming. I can't wait to see how my AC works now. it should be much more efficient!
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