Coolant leaking on passenger floor

[skatey]

I noticed that there was a fluid on my floor mat and when I lifted it up my floor was soaked in what seems to be coolant. It seems to be leaking down on other things making it hard to trace but my initial thought was that it may be my heater core or some hose that goes to it in my dash. If anyone can help that would be helpful, thank you.

[Schurkey]

I'm thinking there's only three sources of water in the passenger compartment:

1.  Heater core leaking.  Leaked coolant will have anti-freeze taste/smell.

2.  A/C condensate drain plugged.  Water will not have anti-freeze; may have bits 'n' pieces of leaves or other debris.  My '98 Monte Carlo would blow mist out of the dash vents on corners, because the water would slosh around enough to be atomized by the HVAC fan.  Cleaned all the dreck out of the condensate tube, and replaced the duckbill.  Dropped over a quart of water out of the HVAC box; and the water rusted the HVAC fan resistor pack so badly I couldn't disconnect the wire harness.  Had to replace the resistor pack AND the wiring connector.

3.  Weatherstrip or windshield leakage.  Only leaks when it rains or the car is parked under a sprinkler.