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Stock JK TechBulletin board forum regarding issues with OE (original equipment) components of the Jeep JK Wrangler (Rubicon, Sahara, Unlimited and X) such as factory suspension parts, engine, transmission, body parts, interior fixtures and the on-board computer.
Thats what im inclined to say as well. I have to get a hose and do a water test - prob get to that this weekend.
It was happening to me and coming in where the passenger freedom top met the water channel on the back hard top towards the outermost edge near the rain channel. I took the top off, re-seated the panels, and tightened everything and it got better.
Idk if you have a hard or soft top, but this should help
h ttp:/ /jeep-club.net/graphics/manuals/85/JK_Water_Leaks_All.pdf