your heater core is leaking i would replace it.
Antifreeze will be leaking in the floorboard on the passenger side, there will be a smell of antifreeze through the vents.
water in passenger floorboard, where is the hose that would cause this?
Does it smell like antifreeze? If so, it is most likely a bad heater core, or one of the hoses feeding it.
A damaged heater core will cause coolant or water to leak onto the passenger floorboard.
it might be a hose but most likely its the heater core
Passenger floorboard
Passenger's side? Could be a leaking heater core
passenger side, down by the floorboard.
passenger side floorboard
normally you have no heat and,or water on the passenger floorboard
Passenger side floorboard under carpet.
heater core is leaking.