I haven't touched the A/C since August of last year and I've already installed the j-tube fix. I've sealed up around the heater core and the cowl drain appears unclogged (just checked it this AM).
This is not a case of water free flowing into the cab or moisture wicking up through the carpet. The moisture was on TOP of a rubber mat and there was no standing water in the Jeep. It was just a fine layer of moisture well away from the dash. When I got out of the Jeep, it was dry. When I came back to go to lunch, that layer was there. The safari top, doors, jammer, duster, and Rain Gear cover ensured no water was coming in to the cab directly. If there was a leak, I woulda seen a LOT more evidence of a leak for that area to get wet (ie, 1-2" of water would have to be there).
I'm thinking it was an environmental condition of the high humidity, low air circulation, and heat from the floor/exhaust that caused the condensation to form. When I went home yesterday, it was all dry. Once I was home, I left the cover off and window down (it had stopped raining) and let the air just blow. When I covered it last night, it had dried out and the floor/exhaust was cool. I checked it this AM when I left for work - bone dry.