16 5700 xe, rear ac blowing warm

Discussion in 'Western Star Forum' started by scokat, Jul 6, 2019.

  1. scokat

    scokat Bobtail Member

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    Oct 14, 2013
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    2016 rear ac blowing warm air, put gauges on high and low side, proper pressures, front ac goes down to 66, but rear ac still blows warm. took drawers out and watched the actuator move from side to side when switching from heat to ac. Any suggestions on where to start?
     
  2. Cetane+

    Cetane+ Road Train Member

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    Sep 29, 2013
    Albany, NY
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    Do the lines feel cold that go to the rear blower? Are the heater lines still hot? Do you need to turn the heater line valves off?
     
  3. scokat

    scokat Bobtail Member

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    Oct 14, 2013
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    lines are ice cold, do i need to cut off the heater lines?
     
  4. Cetane+

    Cetane+ Road Train Member

    1,296
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    Sep 29, 2013
    Albany, NY
    0
    If you turn off the heater lines and it blows cold it might tell you that the valve to turn off the hot water to the heater core is not working right. Or you just need to turn off the heater lines to get maximum cold.
     
  5. scokat

    scokat Bobtail Member

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    Oct 14, 2013
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    I looked but could not see the shutoff valves, anyone have info for a 5700, probably in front of my eyes but i cant see them.
     
  6. ShortCircuit

    ShortCircuit Bobtail Member

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    May 7, 2017
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    I don’t believe bunk has heater shutoff valve on 5700. Heater is always on only air selection flap controls which side cabin air is pulled from. I ended up installing a brass ball valve on the hose that supplies coolant to the bunk heater in the engine compartment. There are two hoses above EGR that connect to metal pipes and run parallel with the R134 refrigerant loop under the cab that deliver and return coolant. You can just split the hose and install inline valve. In the summer just open the hood and cut off coolant circulation.
     
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