Heating issues

Discussion in 'International Forum' started by OntarioTrucker2014, Dec 13, 2019.

  1. OntarioTrucker2014

    OntarioTrucker2014 Bobtail Member

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    Dec 13, 2019
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    I have a 2014 lonestar with Cummins isx power. Lately I have been having problems with my HVAC system. I have had to keep moving the blending disk more and more to the hot end to get heat (when I did, I got great heat), now I have it full on heat and unless I engage the ac on max (which limits outside air if I remember correctly), I don’t get any heat into the cabin at all. Is the problem in the blending of the air or do I need to be looking some place else. Please help.
     
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  3. PhilBillyFord6.0

    PhilBillyFord6.0 Bobtail Member

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    Dec 13, 2019
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    Sounds like the temp blend door or actuator, or the heater control valve. There is a valve on the coolant lines running to the heater core that is electronically controlled by the module on the dash. Have someone else turn the dial and watch the arm of the valve if it has full 90 degree movement I'd suspect the blend door or actuator.
     
  4. OntarioTrucker2014

    OntarioTrucker2014 Bobtail Member

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    Dec 13, 2019
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    Thanks, can you tell me where these are located?
     
  5. Brandt

    Brandt Road Train Member

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    Sep 17, 2012
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    Make sure the engine is hot like normal also. Sometimes in really cold temps or if the engine thermostat are wide open your engine coolant will show cold on the dash. Then you won't have any heat in the truck.
     
  6. OntarioTrucker2014

    OntarioTrucker2014 Bobtail Member

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    Dec 13, 2019
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    Thanks, temp fluctuates slightly but is steady around 185 at normal operating speeds
     
  7. PhilBillyFord6.0

    PhilBillyFord6.0 Bobtail Member

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    Dec 13, 2019
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    The Heater control valve is on the passenger side of the engine compartment, near the fire wall. The blend door and actuator for temp will be behind the passenger side kick panels near the door or firewall.
     
  8. PhilBillyFord6.0

    PhilBillyFord6.0 Bobtail Member

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    Dec 13, 2019
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    Good point.
     
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