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Heater

Discussion in 'Peterbilt Forum' started by JTS51, Aug 9, 2012.

  1. Aug 9, 2012 #1
    JTS51

    JTS51 Bobtail Member

    4
    0
    Sep 3, 2011
    Hudson WI
    0
    I've got a 2011 377 medium duty. When I've got the vents on and the heat control turned full cold the vent air is about 30 degrees warmer than the outside air. When I turn the temperature control knob to full cold and full hot I can hear the mixing door operate and sounds like it is closing when it stops. It thumps like a door closing. Is this air temperature difference normal? Would it help if I valved off the hot water hose to the heater in the warm months so the ductwork area doesn't pick up heat from the heater core?
     
    JTS51, Aug 9, 2012
    JTS51, Aug 9, 2012
    #1
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  3. Aug 9, 2012 #2
    dannythetrucker

    dannythetrucker Road Train Member

    2,856
    4,032
    May 26, 2011
    everywhere, man
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    it always helps to shut off the water to the heater core, why would you want a big block full of 200 degree water sitting there if you're trying to cool the cab ?
     
    dannythetrucker, Aug 9, 2012
    dannythetrucker, Aug 9, 2012
    #2
    aiwiron Thanks this.
  4. Aug 10, 2012 #3
    JTS51

    JTS51 Bobtail Member

    4
    0
    Sep 3, 2011
    Hudson WI
    0
    Thanks for the reply. Can I just cut the supply hose and clamp in a brass valve, or the return hose or both?
     
    JTS51, Aug 10, 2012
    JTS51, Aug 10, 2012
    #3
  5. Aug 18, 2012 #4
    Turbo55

    Turbo55 Bobtail Member

    9
    0
    Mar 13, 2012
    0
    ALWAYS run on recirculate, never fresh air.
     
    Turbo55, Aug 18, 2012
    Turbo55, Aug 18, 2012
    #4
  7. Aug 19, 2012 #5
    QUALITYTRUCK

    QUALITYTRUCK Road Train Member

    1,817
    1,783
    Jun 14, 2009
    romulus,mi
    0
    i service a fleet of these.the heater control valve under hood behind air cleaner on fire wall is leaking internal.i am changing them at least twice a year.easy fix.do it yourself.good luck.
     
    QUALITYTRUCK, Aug 19, 2012
    QUALITYTRUCK, Aug 19, 2012
    #5
  8. Aug 19, 2012 #6
    aiwiron

    aiwiron Road Train Member

    5,927
    5,228
    Aug 24, 2011
    Sunny Tampa Florida
    0
    Most have a shut off valve for the cab hose on the engine.
     
    aiwiron, Aug 19, 2012
    aiwiron, Aug 19, 2012
    #6
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