heat blows out cold air on 2000 Dodge Stratus

why does my 2000 dodge stratus blow out cold air instead of hot air?

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2 answers
2001 Stratus SE: found that "Heater/AC control unit" on dash was bad. (Electronic) Checked everything else prior. Easy to change, junkyard part.
Hazleton, PA.
Check to see if you have coolant, see if thermostat is opening up or not, Heater core