hes talking about the fluid sprayer for the rear wiper. i would be checking the door seal. but working for Chevrolet for few years and doing all the water testing the easiest way is to put one person outside and one inside with the hose and a flashlight. if you cant see where its coming from start taking panels off till you do.
Remember--The guy with the water hose should be on the OUTSIDE!
Water is said to be the hardest thing to keep in or out. Jeeps aren't the only vehicles to have problems. I bought a Ford Bronco II that had a bad windshield leak. Every time it rained I'd have to vacuum a gallon of water out of the footwell. Finally sealed it up with Silicone Sealer. I came to the conclusion that the windshield was installed by a drunk.
