Using the AC a lot this summer. Passenger floorboard has become wet with water even collecting under the passenger seat. I had the same problem in another car but saw the water leaking though the air duct pushing air on the floor and knew the drain on the firewall was blocked so I removed and cleaned out the AC drain pipe and had no problems. This car does not have the rubber drain piece attached and is draining with no possibility of obstruction. I cannot see the origin of the water so I am stumped. I went to parts store and they suggested my heater core is leaking even though I am not operating the heater and the liquid on the floorboard is not yellow/green in tint. Can anyone please help me with this?

 

if its cold water on the inside the ac drain is clogged or the rubber part that directs the drain down is missing. When you have the ac on do you have the air flow in recirculate mode? If not do it it will make the pressure inside greater then the outside when driving and force the water outside.