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A/C Problems

Discussion in 'Peterbilt Forum' started by wagasser, May 12, 2014.

Page 2 of 2
  1. May 13, 2014 #11
    wagasser

    wagasser Bobtail Member

    32
    7
    Nov 5, 2013
    0
    Well there is the expansion valve in the sleeper...

    Is it worth hitting it with a hammer....I mean tapping it??


    [​IMG][/URL][/IMG]

    [​IMG][/URL][/IMG]
     
    wagasser, May 13, 2014
    wagasser, May 13, 2014
    #11
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  3. May 13, 2014 #12
    EverLuc

    EverLuc Light Load Member

    295
    101
    Feb 18, 2013
    0
    My 379 is doing the same thing. Yet, I replaced the expansion valve last summer and it all worked great. Guess I am going to replace it again today. I did "tap" it for grins. No change in cooling performance.
     
    EverLuc, May 13, 2014
    EverLuc, May 13, 2014
    #12
  4. May 13, 2014 #13
    wagasser

    wagasser Bobtail Member

    32
    7
    Nov 5, 2013
    0
    Well at least I am not the only one.
    Question when you did the work or a maybe at a shop...
    What was your process?
    Did you vacuum the entire system?
    Replace the dryer?
    Replace the orifice at firewall?
    Any thing else???

    Thanks!!!
     
    wagasser, May 13, 2014
    wagasser, May 13, 2014
    #13
  5. May 13, 2014 #14
    EverLuc

    EverLuc Light Load Member

    295
    101
    Feb 18, 2013
    0
    Well, I replaced the compressor, dryer, orifice tube(orange), expansion valve, flushed the condenser, both evaporators, lines, etc. I then vacuumed the system and allowed it to sit overnight w/vacuum attached but not running to ensured a good seal. After charging the system everything worked great all summer. Oh, well. It is what it is.
     
    EverLuc, May 13, 2014
    EverLuc, May 13, 2014
    #14
  7. May 14, 2014 #15
    EverLuc

    EverLuc Light Load Member

    295
    101
    Feb 18, 2013
    0
    I swapped out expansion valve & orifice tube. There was zero change in performance. I did find a few pieces of black plastic gradings & trace amount of sludge on the old orifice tube. I did have good readings on gauges w/out any restriction type fluctuations. 55/160 @ 900 rpms.
     
    EverLuc, May 14, 2014
    EverLuc, May 14, 2014
    #15
  8. May 21, 2014 #16
    wagasser

    wagasser Bobtail Member

    32
    7
    Nov 5, 2013
    0
    So the rear expansion valve all of a sudden started working.?.?

    I am wondering or just my theory. There is that small wire that comes off the expansion valve and goes down and wraps around the return line. It was close to the supply line. If was touching both lines makes me think the expansion valve was not sure if it should be open or closed creating a false reading...??
     
    wagasser, May 21, 2014
    wagasser, May 21, 2014
    #16
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