'06 379 Bunk A/C

Discussion in 'Peterbilt Forum' started by Green Machine, Jun 12, 2012.

  1. Green Machine

    Green Machine Medium Load Member

    Jul 23, 2009
    Having a problem with my bunk A/C and the mechanics are pretty busy right now and are still debating on what to do next. So I thought I would ask you guys to see if you can help me get this bunk A/C working. The A/C up front cools just fine but the bunk blows warm pretty much all the time no matter what. I have shut the coolant lines off that go back there. While running A/C (with or without running the bunk) the one line will be cold and wet while the other is warmish.

    I looked under the bed and noticed there was no filter, so I'm wondering if I should blow out the condenser which will probably make a huge mess inside my truck... I put a filter in there for now but I don't feel much air being pulled through even if the blower is on high.

    Any ideas or troubleshooting tips will be helpful :).
  2. country29

    country29 Medium Load Member

    Feb 27, 2010
    if the cab is blowing cold, and the bunk is blowing warm, yes the evaporator could be stopped up from not having a filter in it, but more than likely the expansion valve is not working right, or is stopped up and needs to be changed.
  3. windsmith

    windsmith Road Train Member

    Sep 2, 2011
    Still sounds like you're getting circulating coolant from the engine. I have my valves shut off (1998 pete 377), and I can still get heat in the bunk. If the heater hoses feel hot going into the bunk air box, then your issue is with the temp control. A warmish high pressure, cold/wet low pressure line on the A/C evaporator says that it's doing what it should.
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