Q: Coolant issue engine overheating don't know cause

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Passenger floor wet. Overheating when driving. No leaking under car.steam coming out vents,smell coolant from vents. Adding water daily. Electrical fan by radiator do turn on. My Ac fan currently doesn't work.im thinking it's heater core. Took of radiator cap when cooled off and noticed black like dirt around the cap on the metal part.

My car has 190000 miles.
My car has an automatic transmission.

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