I have a 90 YJ and a 20 TJ. Both have water leaks on the pass. side. I can't find them. Any ideas?  

tj ... look to condensation drain from the hvac system, or antenna mount.  known problems.

not sure about the yj, but maybe windshield seal, or softop header?

do they leak sitting in the driveway, or only when driven?  that will help you pinpoint the problem.

P

If the holes that drain the pan under the cowling you could be getting water in through some of the gromets that go  into the tub area. You could have a dad heater hose. Check where the heater hoses come in and check for unsealed gromets at the fire wall.