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bunk heat not working

Discussion in 'International Forum' started by TruckerChance, Dec 10, 2018.

  1. Dec 10, 2018 #1
    TruckerChance

    TruckerChance Bobtail Member

    20
    1
    Nov 30, 2018
    Baltimore MD
    0
    2015 international prostar. ISX15 412,000 miles.

    While my truck is idling, my heat in the cab works great. (NOT THE BUNK HEATER) in the bunk space the air is coming out cold.

    I don’t believe I have a shut off valve for the coolant line to the bunk. I went under the bunk and popped one of the coolant lines off the evaporator core and hot coolant went everywhere.

    Could I have a bad evaporator core?
    Or could it be that door thing that plugs in as a sensor or something?
    Where could I order the parts from ?
     
    TruckerChance, Dec 10, 2018
    TruckerChance, Dec 10, 2018
    #1
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  3. Dec 10, 2018 #2
    xsetra

    xsetra Road Train Member

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    Aug 21, 2011
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    My truck has 2 valves for the bunk heater.
    Supply and return lines, both are under the hood by the motor.
    Check the A/C is turned off.
     
    xsetra, Dec 10, 2018
    xsetra, Dec 10, 2018
    #2
  4. Dec 10, 2018 #3
    TruckerChance

    TruckerChance Bobtail Member

    20
    1
    Nov 30, 2018
    Baltimore MD
    0

    A/C is turned off. I checked under the hood I didn’t see any valves. Can you be more specific on where the valves would be please ?
     
    TruckerChance, Dec 10, 2018
    TruckerChance, Dec 10, 2018
    #3
  5. Dec 10, 2018 #4
    xsetra

    xsetra Road Train Member

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    Aug 21, 2011
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    Trace your coolant hose from your bunk to the engine compartment. I have a Freightliner, all trucks function about the same.
    I found this link,

    .09 Prostar heater doesnt work
     
    xsetra, Dec 10, 2018
    xsetra, Dec 10, 2018
    #4
  7. Dec 10, 2018 #5
    TruckerChance

    TruckerChance Bobtail Member

    20
    1
    Nov 30, 2018
    Baltimore MD
    0
    Thank you I appreciate the help. I’m going to check the link now
     
    TruckerChance, Dec 10, 2018
    TruckerChance, Dec 10, 2018
    #5
  8. Dec 10, 2018 #6
    Heavyd

    Heavyd Road Train Member

    7,626
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    Feb 4, 2009
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    Ok, next time you are checking for coolant flow, you shouldn't need to remove a coolant line and spill coolant everywhere, just feel the lines at the bunk, if they are both warm/hot, then coolant flow is ok. You likely have a bad temp blend door actuator, they are a common failure item.
     
    Heavyd, Dec 10, 2018
    Heavyd, Dec 10, 2018
    #6
    TruckerChance Thanks this.
  9. Dec 10, 2018 #7
    TruckerChance

    TruckerChance Bobtail Member

    20
    1
    Nov 30, 2018
    Baltimore MD
    0

    Thank you very much. I’ll replace that and see what happens.
    The lines definitely are warm and coolant flows through.
     
    TruckerChance, Dec 10, 2018
    TruckerChance, Dec 10, 2018
    #7
  10. Dec 15, 2018 #8
    TruckerChance

    TruckerChance Bobtail Member

    20
    1
    Nov 30, 2018
    Baltimore MD
    0

    That definitely was the issue. I truly appreciate your input
     
    TruckerChance, Dec 15, 2018
    TruckerChance, Dec 15, 2018
    #8
    Heavyd Thanks this.
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