Do you notice it only at certain times like rain? Being winter snowy boots? A smell of coolant? While I am blessed with a ride that does not leak I do know that moist air must come into contact with a cold surface to condense.
With a helper on the other side, take a bottle of compressed air (the can you buy at Office Depot works fine) and spray around windshield gasket. If you don't have a helper, spray something that foams a little around the outer side of the gasket and then spray the air.
Thanks for the help. I now have a cover over the whole Jeep. It is make for storage, and I have placed a heater inside. Guess I will just have to see the outcome.