SOURCE: ac blows hot air
check your air diverter doors, sounds like the door for heat is open, when a/c is selected the doors should move and close the heater off. the heater will over power the a/c. the door controller is located on the environmental station under the dash neat to the floor. the control is electronic and probably not functioning
SOURCE: HOT & COLD ELECTRIC VENTS NOT MOVING.
Blend door actuator. When it fails for some reason it turns to the hot side and gets stuck. Dash must come out. I usually do it in 3 hours, because I've done it numerous times.
SOURCE: Temperature Control not working on 1999 Ford Explorer
Sounds like your temperature actuator is not moving or your temp door is broken. On max a-c ,coolant is shut off to your heater core allowing only cold air in.
SOURCE: 2004 ford crown vic old
no electric door but there is a vacum door on the passengers side that more then likely is not closing all the way.
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