Heat only works @90*

Discussion in 'Interior' started by Spaceman Spiff, Sep 9, 2018.

  1. Spaceman Spiff

    Spaceman Spiff TYF Newbie

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    Eric
    05 Tahoe, auto climate control.
    Just purchased in late July.
    Today temps went down to mid 50’s, so I figured it would be a good time to test the heat out.
    Well, it only blows hot/warm at the max, 90* setting. Even if I put it to 89*, it starts to blow cool air.
    Set both sides to the same temp, or on different settings, it’s the same thing.
    Is this common? I would say heater core flush, but why would it only work on max temp?
    A/c blows cold, no problems there.
     
  2. Doubeleive

    Doubeleive Elite Member Supporting Member

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    Wes
    either you need the blend door actuators recalibrated, or the actuators are bad, or the control module is bad, pretty unlikely to be anything with the heater core at all unless your truck has no thermostat and runs cold all the time
     
    swathdiver likes this.
  3. swathdiver

    swathdiver Full Access Member

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    What He said! ^^^^
     

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