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AC problem on kw t660

Discussion in 'Trucks [ Eighteen Wheelers ]' started by pavrom, Aug 29, 2018.

Page 1 of 2
  1. Aug 29, 2018 #1
    pavrom

    pavrom Road Train Member

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    When truck idles - ac blowing cold , when driving - barely cold , bit uncomfortable .
    Freon full , speeds - ok , recirculation or fresh switch - no difference , changing floor/front/window - all good . Any ideas before I bring it to dealer ?
    I drove the truck for already 10k miles since new engine been installed and it's always been this way
     
    pavrom, Aug 29, 2018
    pavrom, Aug 29, 2018
    #1
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  3. Aug 30, 2018 #2
    86mechanic

    86mechanic Medium Load Member

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    Could be freezing up, maybe they overcharged it.
     
    86mechanic, Aug 30, 2018
    86mechanic, Aug 30, 2018
    #2
  4. Aug 30, 2018 #3
    pavrom

    pavrom Road Train Member

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    NE illinois
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    Mechanic checked freon level ...before was probably at 60% , charged completely to specs - no difference ...reg ular Indy ...maybe missing something , fixed my other truck ac though but different issue
     
    pavrom, Aug 30, 2018
    pavrom, Aug 30, 2018
    #3
    86mechanic Thanks this.
  5. Aug 30, 2018 #4
    boneebone

    boneebone Road Train Member

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    Did you ever change the orifice tube/expansion valve and the receiver/dryer when you serviced the A/C?

    A dirty or failed orifice tube/expansion valve will affect A/C temperature and performance.
     
    boneebone, Aug 30, 2018
    boneebone, Aug 30, 2018
    #4
    spsauerland Thanks this.
  7. Aug 30, 2018 #5
    truckdriver31

    truckdriver31 Road Train Member

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    put gauges on it. dont waste anymore time or money.
     
    truckdriver31, Aug 30, 2018
    truckdriver31, Aug 30, 2018
    #5
    spsauerland Thanks this.
  8. Aug 30, 2018 #6
    truckdriver31

    truckdriver31 Road Train Member

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    FC80F580-8A6D-4EDA-A5DB-A6732DF66DAA.png 7D2F9D56-12C8-41A2-9606-93376026AED2.png
     
    truckdriver31, Aug 30, 2018
    truckdriver31, Aug 30, 2018
    #6
  9. Aug 30, 2018 #7
    truckdriver31

    truckdriver31 Road Train Member

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    these charts are for 134a. you charge 134a using only the outside air temp. like others said bad orifice tube or expansion valve. also check cab filter and evap. could be dirty evap
     
    truckdriver31, Aug 30, 2018
    truckdriver31, Aug 30, 2018
    #7
  10. Aug 30, 2018 #8
    truckdriver31

    truckdriver31 Road Train Member

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    did he break the system. if so then more then likely the dryer/receiver has filled up with humidity and causes beads to come out. in that case expanson or orifice is clogged. you also change dryer/receiver when you break system.
     
    truckdriver31, Aug 30, 2018
    truckdriver31, Aug 30, 2018
    #8
  11. Aug 30, 2018 #9
    spsauerland

    spsauerland Road Train Member

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    Sounds like usual symptoms of bad TXV on a B cab KW.
     
    spsauerland, Aug 30, 2018
    spsauerland, Aug 30, 2018
    #9
  12. Aug 30, 2018 #10
    pavrom

    pavrom Road Train Member

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    Apr 29, 2012
    NE illinois
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    What's txv ?
     
    pavrom, Aug 30, 2018
    pavrom, Aug 30, 2018
    #10
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