2003 pontiac montana van leaks water into front floorboard. where is this...

[darrell]

...coming from? It seems to leak while it is raining outside.

 

[Chris B]

Is That When You Use Your Heater Alot, Its The Heater Core Is It On Passenger Side

 

[draggin78201]

If it only leaks when it is raining, more than likely you have a bad windshield seal.