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AC Problem

Discussion in 'Peterbilt Forum' started by needtoknownow, Jun 19, 2014.

  1. Jun 19, 2014 #1
    needtoknownow

    needtoknownow Bobtail Member

    12
    1
    Sep 14, 2013
    0
    The A/C in my 2004 Peterbilt 379 was working great and then it stopped blowing cold air. the compressor works, the compressor clutch is new, the blower motor is good, dryer is new,full of freon. when I tried to let some of the freon out a grey foamy substance came out of the line. When I replaced the dryer the same grey foam came out of the lines. I would appreciate any help I can get.
     
    needtoknownow, Jun 19, 2014
    needtoknownow, Jun 19, 2014
    #1
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  3. Jun 19, 2014 #2
    Trygg

    Trygg Light Load Member

    221
    187
    Feb 11, 2014
    The West
    0
    Get rid of the grey foamy stuff. :biggrin_25519:
     
    Trygg, Jun 19, 2014
    Trygg, Jun 19, 2014
    #2
    needtoknownow Thanks this.
  4. Jun 19, 2014 #3
    popcorn169

    popcorn169 Road Train Member

    2,194
    1,712
    Sep 5, 2011
    state of confusion
    0
    Have you replaced the expansion valve? I drive an 07 Columbia with a CAT and it stopped blowing cold air. First it was the compressor then when it quit again I checked and the lines where frozen when I showed the mechanic he replaced the expansion and it is working fine.
     
    popcorn169, Jun 19, 2014
    popcorn169, Jun 19, 2014
    #3
    needtoknownow Thanks this.
  5. Jun 19, 2014 #4
    baha

    baha Road Train Member

    4,137
    2,834
    Jul 25, 2013
    ga
    0
    To much oil in sys. stoping up the works
     
    baha, Jun 19, 2014
    baha, Jun 19, 2014
    #4
    needtoknownow Thanks this.
  7. Jun 19, 2014 #5
    snowwy

    snowwy Road Train Member

    19,790
    12,333
    Jul 6, 2009
    0
    it cracks me up how everyone TRIES to diagnose their problems.

    WITHOUT EVEN HOOKING UP A GAUGE to see what's going on.

    grey foam is air bubbles in the oil.

    youi could be over pressured. or under pressured. or you could have a blockage somewhere.

    GAUGES. best tool for diagnosis. found at any harbor freight for $60.
     
    snowwy, Jun 19, 2014
    snowwy, Jun 19, 2014
    #5
    pushbroom, needtoknownow and Chewey Thank this.
  8. Oct 31, 2018 #7
    Angelahsaw

    Angelahsaw Bobtail Member

    1
    0
    Oct 31, 2018
    0
    I need to know how to replace an AC dryer in a 2005 379 Peterbilt . Can anyone help me out?
     
    Angelahsaw, Oct 31, 2018
    Angelahsaw, Oct 31, 2018
    #7
  9. Nov 9, 2018 #7
    Rideandrepair

    Rideandrepair Road Train Member

    16,526
    53,943
    Aug 8, 2015
    0
    Grey foam could be contamination from last compressor failure.Even if lines were flushed very hard to get contaminants out of evaporator.
     
    Rideandrepair, Nov 9, 2018
    Rideandrepair, Nov 9, 2018
    #7
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