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389 only getting Luke warm heat

Discussion in 'Peterbilt Forum' started by MackRS700L, Aug 26, 2018.

  1. Aug 26, 2018 #1
    MackRS700L

    MackRS700L Bobtail Member

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    Aug 26, 2018
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    I’m working on a 2015 389 day cab. The heater blows luke warm air. I pulled the plastic cover from the passenger side to check the electric actuators. They are all working properly when you work the controls. The heater hoses going to the heater core are hot at operating temperature. The coolant hoses on the engine are all hot at operating temperature. I pulled the metal plate off that covers the heater core inside the cab and the tubes on the core are hot. Does anybody have any ideas as to what can be the problem?
     
    MackRS700L, Aug 26, 2018
    MackRS700L, Aug 26, 2018
    #1
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  3. Aug 26, 2018 #2
    stillwurkin

    stillwurkin Road Train Member

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    Dec 2, 2017
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    Actuator may be moving, but not far enough to let all the air through. In this case hot air. Had one that moved but plastic gears were stripped and it put on a show but movement was limited . Just a wild guess. Mayby remove actuator and manually move heater door to see if it will move farther?
     
    stillwurkin, Aug 26, 2018
    stillwurkin, Aug 26, 2018
    #2
  4. Dec 10, 2022 #4
    SoIllfrmr

    SoIllfrmr Bobtail Member

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    Dec 10, 2022
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    Did you ever figure out the problem? I’ve got the same thing going on right now.
     
    SoIllfrmr, Dec 10, 2022
    SoIllfrmr, Dec 10, 2022
    #4
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