2003 S10 - I get water on the pass side floor. I checked the windshield and the cowl drains, and they're OK . Only thing left is the AC drain is disconnected or plugged. Any clues where that drain is before I rip everything out to find it? Pics would help a lot

 

Is it antifreeze or clean water? It could be coming from a leak in the heater core. If you have antifreeze in the radiator it should be easy to tell.