The heater core is leaking. The whole dash has to come out to fix it. Even master mechanics dread a heater core repair. Try some alumapowder in the radiator. Try some of this, it really works and stops leaks without plugging up the radiator.
Passenger's side? Could be a leaking heater core
Antifreeze will be leaking in the floorboard on the passenger side, there will be a smell of antifreeze through the vents.
heater core is leaking.
Probably a leaking heater core.
bad door seals
This would be caused by a leaking heater core, or a leak in the plumbing associated with it.
If that water is engine coolant, the heater core is leaking.
your heater core is leaking i would replace it.
Either the heater core is leaking or you have a leak at the windshield or the cowl. If the fluid tastes sweet it is coolant and your heater core is leaking.
The heater core (a small radiator for your heat) is leaking, I would suggest a new heater core as they are about as cheep to replace as they are to repair.
your ac might be clogged or your draining hose is clogged. its in that area
The condensor drain tube is clogged. Find the drain line and unclogg it.