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Cannot control heat

Discussion in 'Heating and Air Conditioning' started by Acmeace, Oct 12, 2017.

  1. Acmeace

    Acmeace New Member

    Oct 12, 2017
    Likes Received:
    Wife's 1997 Windstar 3.8 the heater worked correctly one day and the next we couldn't turn the heat down or off, all other controls defrost, floor, vent and AC works correctly as does the fan switch. The AC compressor starts when AC setting is selected, but no matter where you set the TEMP control the air coming out remains the same HOT not warm or cool just hot. ANY help with this would be greatly appreciated.
  2. Dominick 1

    Dominick 1 Well-Known Member Respected Member

    Dec 26, 2014
    Likes Received:
    Parkersburg Wv
    Welcome to the Forum
    Can you pull off the control knob and see if it is broken
    Action likes this.
  3. Action

    Action Moderator Staff Member Respected Member

    Mar 22, 2014
    Likes Received:
    Phoenix, AZ 85008
    Welcome to the FFO!

    Temperature control is maintained by a door. The door is usually controlled by a cable via the control on the instrument panel. I believe Dominick is correct it is a knob. The knob spins a control behind it that is likely attached to some type of cable arrangement. (One and sometimes 2 cables) If the control or the cables are faulty the temperature will stay where it was last set.

    Assuming the vehicle has AC and the temp control is broken. A temporary measure would be to turn on the AC. By turning on the AC the system should activate a vacuum valve that nearly shuts off hot water going to the heater core. This isn't a 100% and it will take a good chunk of heat out of the system.


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