AC/Heater controls

[ee1978ta]

AC is on maximum or off. The heater is the same way - real hot or not on. How do you get the the mixer door operator and is it vacuum operated or electric?

 

[Sapperfire]

Are you reffering to fan speed or actual temperature?

If you're getting both hot and cold I wouldn't think you're having a blend door issue, Sounds like the climate control module is bad (the part with the buttons on it)
what year is your Mark?