'06 379 Bunk A/C

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

  1. Green Machine

    Green Machine Medium Load Member

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    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

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    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

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    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.