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379 Heater Deflector Control ??

Discussion in 'Peterbilt Forum' started by The Truckist, Dec 21, 2011.

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  1. Dec 21, 2011 #1
    The Truckist

    The Truckist Medium Load Member

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    Sep 11, 2010
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    Hey Pete people...I know about these heater & A/C control do-hickies under the dash that control the direction of the hot air, etc...you already know what I'm talking about. Somebody called em "pianos" I guess because they look like the top of a baby grand. I'm not sure the official name...it's the electronic control for the deflector doors I think. All the Pete's I've owned, I have never had to replace one and I'm told they are very weak items and go bad all the time. I think it's finally my turn. Bunk heat is not producing and I have been hearing a slight "creaking" under the dash (lower center right) as the door operates when temp is adjusted or control switch position is changed.

    Tell me which one is bad if it don't send heat to the sleeper? I hear there are 2 or maybe 3 total in the system?

    Thanks.
     
    The Truckist, Dec 21, 2011
    The Truckist, Dec 21, 2011
    #1
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  3. Dec 21, 2011 #2
    mslashbar

    mslashbar Medium Load Member

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    Jul 22, 2009
    elizabeth,co
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    My 379 is probably way older than yours (1990), But my bunk has its own hvac unit in the right side box. It has seperate water lines going to it off the motor, and isn't controlled by anything under the dash, that stuff is just for the cab.
     
    mslashbar, Dec 21, 2011
    mslashbar, Dec 21, 2011
    #2
    H2oburymatt Thanks this.
  4. Dec 21, 2011 #3
    The Truckist

    The Truckist Medium Load Member

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    My bunk's the same way. Got its own system but it seems there is something other than the manual shut off valves keeping it from circulating. I thought maybe Pete might have used one in the bunk system.
     
    The Truckist, Dec 21, 2011
    The Truckist, Dec 21, 2011
    #3
  5. Dec 21, 2011 #4
    mslashbar

    mslashbar Medium Load Member

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    elizabeth,co
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    Does the fan in the bunk work? Feel the hoses going back to the bunk, if the're not getting hot than you either have one of the valves closed, or a restriction in the bunk unit somewhere. There shouldn't be any blend doors in the bunk.
     
    mslashbar, Dec 21, 2011
    mslashbar, Dec 21, 2011
    #4
  7. Dec 21, 2011 #5
    The Truckist

    The Truckist Medium Load Member

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    Yep...fan works fine. Past week it didn't blow warm in the bunk. Works fine up front. I had opened the valves a few weeks ago and it has been blowing warm up til last week.
     
    The Truckist, Dec 21, 2011
    The Truckist, Dec 21, 2011
    #5
  8. Dec 21, 2011 #6
    mslashbar

    mslashbar Medium Load Member

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    Jul 22, 2009
    elizabeth,co
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    Are you sure you didn't accidently hit any of the control switches in the bunk? I know in mine I have a toggle switch for heat and ac, and then a little themostat control for the temp. Maybe one of those switches is bad.
     
    mslashbar, Dec 21, 2011
    mslashbar, Dec 21, 2011
    #6
  9. Dec 22, 2011 #7
    The Truckist

    The Truckist Medium Load Member

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    Sep 11, 2010
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    Same in my '07. Front & back units work together though even if they are located apart. Summer...all I ever had to do was set the bunk A/C on low and toggle the rear switch on the dash. Even with fan off up front it still blew through the vents up front.
     
    The Truckist, Dec 22, 2011
    The Truckist, Dec 22, 2011
    #7
  10. Dec 23, 2011 #8
    paul 1052

    paul 1052 Heavy Load Member

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    Oct 9, 2010
    Sand Springs, Ok.
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    The deflectors are called "blend doors".
     
    paul 1052, Dec 23, 2011
    paul 1052, Dec 23, 2011
    #8
    The Truckist Thanks this.
  11. Dec 23, 2011 #9
    Krooser

    Krooser Road Train Member

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    Jul 25, 2010
    Wisconsin
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    I've been running without bunk heat for 5 years now... I have been using the ESPAR to keep it warm back there but I guess this is the year for a new $500.00 heater core....
     
    Krooser, Dec 23, 2011
    Krooser, Dec 23, 2011
    #9
  12. Dec 24, 2011 #10
    pullingtrucker

    pullingtrucker Road Train Member

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    Dec 21, 2008
    Fostoria, Ohio
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    The two heater systems only share a couple of items. Those items would be the AC lines and one circuit that connects them. This circuit is used when the cab blower motor is shut of and the bunk blower motor is activated. No matter if the bunk is on AC or heat it will activate the cab system to whatever the cab is set on...kind of a stupid setup, but it is what it is. As for your problem, I would check what the others have mentioned (the lines for flow and the switch positions. The noise you hear under that dash will not affect anything with the bunk heat/AC. My guessis if the fan is blowing enough air then the heater lines are either shut off or plugged.
     
    pullingtrucker, Dec 24, 2011
    pullingtrucker, Dec 24, 2011
    #10
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