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You may have a clogged heater core, or a leak in the system somewhere. Take your car to a mechanic who can replace the heater core or diagnose the leak.
Heater core
The leak is most likely coming from the heater core or a heater hose near the fire wall.
Heater core is shot, its monted on the firewall behind center console/instrument cluster. When turning on heater fan, will dischrge coolant out of the vent. Replace heater core to resolve the leak
Heater hose or heater core.
it is behind the glove compartment. it will leak on the passanger side floor if it's bad.
that is the heater core that is leaking which is located behind the radio.
sounds like you may have a vaccum leak or a broken line to the vaccum podes on the controler behind your dash, these open and close the door to direct the air flow
Heater core.
It's the block heater. I had the same problem.
Floor at passenger side? Could be heater core needs replacing Other possibilities: door seal windshield seal
Probably valve gasket leak. Can be done yourself but requires some moderately complicated disassembly.