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AC blows warms after running a bit

Discussion in 'Peterbilt Forum' started by kwforage, Jun 17, 2012.

  1. Jun 17, 2012 #1
    kwforage

    kwforage Road Train Member

    1,047
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    Jun 3, 2007
    Wisconsin
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    94' 379. I bought it with no working AC. Charged it and it worked for a day till I found a hole in the condenser. I put on a new condenser and two new lines and recharged it. Now it blows cold for a few minutes then warm. If I shut it off for a while it will blow cold again for a bit and do the same thing. Have not been able to see if the compressor is still engaged while blowing warm but plan to look into it more tomarrow. Any ideas?
     
    kwforage, Jun 17, 2012
    kwforage, Jun 17, 2012
    #1
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  3. Jun 18, 2012 #2
    bender

    bender Road Train Member

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    Don't Kid Yourself
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    Anytime a system has a hole and loses all charge as well as opening the system for repair it will accumulate moisture in the system which the dryer or accumulator will accumulate moisture to its capacity, so the dryer/accumulator should always be replaced.

    There are many possibilities for your issue so more info is needed. Did you vacuum the system before charging? Did you monitor pressure readings with guages? What kind of shape are the evaporator and filters in?
     
    bender, Jun 18, 2012
    bender, Jun 18, 2012
    #2
  4. Jun 18, 2012 #3
    cowcatcher

    cowcatcher Light Load Member

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    Ridin' round with the top down !
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    Sounds like it could be freezing up.
     
    cowcatcher, Jun 18, 2012
    cowcatcher, Jun 18, 2012
    #3
  5. Jun 18, 2012 #4
    kwforage

    kwforage Road Train Member

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    Jun 3, 2007
    Wisconsin
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    After Peterbilt oreder a couple of the wrong ones, and then told me they could not find a replacement I said screw it on replacing the dryer. Peterbilt charged it so ya it was vaccumed.

    Bingo. The drain seemed to be plugged and the evaporator was freezing. I shoved a wire up the drain tube and a bunch of water came pouring out. Seems good now.
     
    kwforage, Jun 18, 2012
    kwforage, Jun 18, 2012
    #4
  7. Sep 3, 2012 #5
    MackDaddyMark

    MackDaddyMark Medium Load Member

    311
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    Jun 14, 2010
    Elizabeth, New Jersey
    0
    I am having a similar problem both the Low pressure line and the filter are freezing up to the point where there is visible ice on the outside. Where is the drain? 96 378 Cat 3406C
     
    MackDaddyMark, Sep 3, 2012
    MackDaddyMark, Sep 3, 2012
    #5
  8. Sep 3, 2012 #6
    Grumppy

    Grumppy Trucker Forum STAFF Staff Member

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    West Monroe, La
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    This was my first thought...
     
    Grumppy, Sep 3, 2012
    Grumppy, Sep 3, 2012
    #6
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