not sure where this is coming from. Have a 97 plymouth voyager. In the last few months I have noticed everytime it rains hard when I start the vehicle up after it sat for a while ( usually (8 hours or so) that when you pull away you here a gurgling in the dash then all of a sudden water starts pouring out onto the passenger floor in the back corner. Sometimes a glassfull or maybe more. Then iits gone until the next hard rain. Nothing is showing above the dash anywhere along the windsheild. The only thing I can think is at the front of the windshield where it goes down under the hood. Maybe I need to get some kind of sealant to run along there or something. I don't see any cracks in the glass. Any thoughts

 

My guess would be that the rubber gasket for the glass is either broken or not sealed to the glass or body.

 

Check the drain for the air intake which is between the back of the hood and the windshield. Leaves, dirt, and other debris probably have the drain clogged.