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2007 freightliner Columbia with weak bunk ac ?

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Hulld, Jul 21, 2016.

  1. Jul 21, 2016 #1
    Hulld

    Hulld Road Train Member

    2,882
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    Oct 19, 2015
    Upstate NY
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    I have a 2007 Columbia that has great in cab ac but very weak ac in the bunk.
    The front ac has good ac down to about 38 degrees in the center vent with a lot of water coming out of the drain.
    The rear bunk gets somewhat cool maybe 58 or 60 degrees with very little water coming out of the drain.
    Every thing looks good when I put gauges on it and the engine fan and ac clutch cycles as should.
    Any ideas ?
     
    Hulld, Jul 21, 2016
    Hulld, Jul 21, 2016
    #1
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  3. Jul 21, 2016 #2
    x1Heavy

    x1Heavy Road Train Member

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    You get under that bunk, as in looking below the cab to see if it frosted over that pipe?

    usually in a Century or similar we relied on the cab air with curtained off glass all around to support the sleeper, whatever it might be putting out, made for a better sleep for us.
     
    x1Heavy, Jul 21, 2016
    x1Heavy, Jul 21, 2016
    #2
  4. Jul 21, 2016 #3
    Hulld

    Hulld Road Train Member

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    Upstate NY
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    I check the pipe under the bunk it gets mildly cool and definitely not cold enough to frost.
     
    Hulld, Jul 21, 2016
    Hulld, Jul 21, 2016
    #3
  5. Jul 22, 2016 #4
    kitCat

    kitCat Light Load Member

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    Oct 13, 2013
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    If the top suggestions don't help, You probably need the expansion valve replaced under the bunk
     
    kitCat, Jul 22, 2016
    kitCat, Jul 22, 2016
    #4
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