water on passager floor

If its not the heater core or the AC drain -Check the windshield rubber seal/grommet and for cracks or holes upfront where the wiper motor/linkage located-

My ******'s Towncar is sopping wet more so in the backseat on the passenger side floor......no windows down. No one seems to know where it is coming from. Car eventually smells moldy. No clue where the water would be coming from. Happens multiple times. Help.

You gonna have to strip it open and dry it-then use the garden hose to duplicate as if its raining-top and bottom

My assumption is that the problem is some how related to the air conditioning drip pan and clogged hoses that connect in that general location under the car.

Check the AC drain tube could be clogged-up and backing it up-

My 96 Town Car had the same leak problem. I fixed it by removing the cover under the hood at the bottom of the windshield (simple, just screws). This give you access to the plastic screen that keeps leaves and other bebris out of the passage to the heater core. Remove this screen and toss any remnant of a gasket that might be there. clean both the under side of the plasic screen and the surface it mates to. Now use blue RTV to create a new "gasket". The RTV can be applied to the under side of the edges of the screen or the surface that the screen mates to. Worked for me!! need more info, just ask.