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Heater on 579..

Discussion in 'Peterbilt Forum' started by drvrtech77, Jan 24, 2019.

Page 1 of 2
  1. Jan 24, 2019 #1
    drvrtech77

    drvrtech77 Road Train Member

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    0
    Have an issue with the heater only blowing truly hot air when i put temp knob up to 80 degrees. .other it blows cool air..what could be the issue?
     
    drvrtech77, Jan 24, 2019
    drvrtech77, Jan 24, 2019
    #1
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  3. Jan 24, 2019 #2
    BCV

    BCV Light Load Member

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    436
    May 26, 2018
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    Is your water temp normal or running cool ?
    Or, you talking bunk heater ?
     
    BCV, Jan 24, 2019
    BCV, Jan 24, 2019
    #2
  4. Jan 24, 2019 #3
    gokiddogo

    gokiddogo Road Train Member

    8,781
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    Mar 5, 2012
    Ontario Canada
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    Got your taps wide open to heater core ?
     
    gokiddogo, Jan 24, 2019
    gokiddogo, Jan 24, 2019
    #3
  5. Jan 24, 2019 #4
    drvrtech77

    drvrtech77 Road Train Member

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    Main system up front.
     
    drvrtech77, Jan 24, 2019
    drvrtech77, Jan 24, 2019
    #4
  7. Jan 24, 2019 #5
    drvrtech77

    drvrtech77 Road Train Member

    12,886
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    Mar 20, 2010
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    Haven't ever touched them...have had trk for going on yr and never had this issue before..
     
    drvrtech77, Jan 24, 2019
    drvrtech77, Jan 24, 2019
    #5
  8. Jan 24, 2019 #6
    drvrtech77

    drvrtech77 Road Train Member

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    Mar 20, 2010
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    Water temp is normal..
     
    drvrtech77, Jan 24, 2019
    drvrtech77, Jan 24, 2019
    #6
  9. Jan 24, 2019 #8
    KentWorthinton

    KentWorthinton Bobtail Member

    2
    3
    Jan 24, 2019
    0
    That hvac system has had actuator problems. Have a dealer run the test with ESA program. There could also be a software update.
     
    KentWorthinton, Jan 24, 2019
    KentWorthinton, Jan 24, 2019
    #8
    pushbroom and drvrtech77 Thank this.
  10. Jan 24, 2019 #8
    pushbroom

    pushbroom Road Train Member

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    Sep 1, 2012
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    Most likely a blend door actuator issue. There were a bunch of faulty actuators and also the possibly of a broken door.
    This does involve digging deeper into the dash so if you aren't experienced, a shop would likely diag it quicker and cheaper. Heater box.png
     
    pushbroom, Jan 24, 2019
    pushbroom, Jan 24, 2019
    #8
    Cat sdp, QUALITYTRUCK, SAR and 2 others Thank this.
  11. Jan 25, 2019 #9
    QUALITYTRUCK

    QUALITYTRUCK Road Train Member

    1,780
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    Jun 14, 2009
    romulus,mi
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    ESA would be best bet to narrow down issue. Above picture is great for reference........if you are working on a Freightliner M2 chassis.
     
    QUALITYTRUCK, Jan 25, 2019
    QUALITYTRUCK, Jan 25, 2019
    #9
  12. Jan 26, 2019 #10
    spsauerland

    spsauerland Road Train Member

    4,296
    10,879
    May 31, 2010
    West Harrison, In
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    Looks like a good reference to me for Paccar NGP/2.1M cabs. This is from HVAC service manual
    Screenshot_20190126-205416.png
     
    spsauerland, Jan 26, 2019
    spsauerland, Jan 26, 2019
    #10
    QUALITYTRUCK and pushbroom Thank this.
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