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APU broken, no A/C to sleeper, help!

Discussion in 'Kenworth Forum' started by jaytrucker78, Jun 19, 2018.

  1. Jun 19, 2018 #1
    jaytrucker78

    jaytrucker78 Bobtail Member

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    Jun 19, 2018
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    i have a 2013 KW T700. I have a Thermoking Tripac APU on it, which broke AGAIN, so not going to bother fixing it. So far it’s cost me more in repairs than what it saved in fuel. So done with it, just going to idle.

    Problem I am having is the A/C in front is ice cold, but the air blowing in the sleeper is warm. I have the front and back controls all set to cool, but nothing seems to make it blow cold.

    I have read other posts, and saw that apparently the unit in the sleeper is a seperate unit, but still uses the same main compressor as the front.

    I also saw something about a “blending door” not closing/opening and improperly mixing the air.

    I am not too mechamically inclined, but can figure out most things. Also not made of riches to keep paying overpriced mechanics. What can I look for/do/adjust/check to troubleshoot this?

    Any help appreciated, pics would be great too. Thanks!
     
    jaytrucker78, Jun 19, 2018
    jaytrucker78, Jun 19, 2018
    #1
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  3. Jun 19, 2018 #2
    supersnackbar

    supersnackbar Road Train Member

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    supersnackbar, Jun 19, 2018
    supersnackbar, Jun 19, 2018
    #2
    Hulld Thanks this.
  4. Jun 19, 2018 #3
    bigdad7

    bigdad7 Road Train Member

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    Do you have air at all in bunk ....my hoses under sleeper come loose some times ...lift up mattress there is an access door
     
    bigdad7, Jun 19, 2018
    bigdad7, Jun 19, 2018
    #3
  5. Jul 8, 2018 #4
    mitchtazz

    mitchtazz Road Train Member

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    The valve to your heater core could be stuck open letting hot coolant circulate when it shouldn't. Or you could have a bad expansion valve.

    The heater core valve is an easier fix.
     
    mitchtazz, Jul 8, 2018
    mitchtazz, Jul 8, 2018
    #4
  7. Jul 10, 2018 #5
    WitchingHour

    WitchingHour Road Train Member

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    Look for the coolant valves on the right side of your engine. Locate the one which supplies the heater core in the sleeper with antifreeze. Shut it off. If the AC in the back suddenly gets cold at that point, you'll looking at a heater control valve issue. PACCAR products tend to have issues with those more often in the driver compartment, but it's not like it never happens with the sleeper.
     
    WitchingHour, Jul 10, 2018
    WitchingHour, Jul 10, 2018
    #5
  8. Jul 13, 2018 #6
    mitchtazz

    mitchtazz Road Train Member

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    I have an 09 T660 and the valve can not be operated manually. Only option to test is to turn heat off then disconnect return coolant hose from valve while engine is running.

    If coolant is flowing then the valve is open when it should be closed.
     
    mitchtazz, Jul 13, 2018
    mitchtazz, Jul 13, 2018
    #6
  9. Jul 13, 2018 #7
    WitchingHour

    WitchingHour Road Train Member

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    I'd just use hose clamp pliers.
     
    WitchingHour, Jul 13, 2018
    WitchingHour, Jul 13, 2018
    #7
  10. Jul 14, 2018 #8
    mitchtazz

    mitchtazz Road Train Member

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    With my luck I'd probably end up cutting through the hose instead of clamping it off. I've been meaning to put a 1/4 turn shut off valve on my heater core lines, but it's been 5yrs and I've yet to do it.
     
    mitchtazz, Jul 14, 2018
    mitchtazz, Jul 14, 2018
    #8
    WitchingHour Thanks this.
  11. Jul 14, 2018 #9
    WitchingHour

    WitchingHour Road Train Member

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    Life gets in the way. I know how that goes.
     
    WitchingHour, Jul 14, 2018
    WitchingHour, Jul 14, 2018
    #9
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