Wet floors in my 2004 chevy venture van

Heater core leaking. Can either bypass it with bypass kit or replace heater core.

It could be that the a/c drain pipe is clogged and not dripping as it should. It's on the firewall under the hood. Pick it up and pinch the end of it to unclog it. If it starts running water like a faucet, that was it.

The previous two answers should answer your problem. If not, check your door gaskets. Yes, after a while they do not seal properly and will leak. That happened to my 2002 Venture after I corrected the initial problem of a plugged A/C drain. So, get in the vehicle and, with the doors and windows shut, have someone spray the windshield and doors with water. Don't focus at the top only, follow the seams to the bottom since the water will run down. If you have a leak it should appear. Hope that helps.

Only on my driver's side the floor carpet is wet...it's stays wet even with no rain

Same here. Only wet on the drivers side.