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A/C DIAGNOSTICS

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Dieselman81, Jun 30, 2019.

  1. Jun 30, 2019 #1
    Dieselman81

    Dieselman81 Bobtail Member

    1
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    Jun 30, 2019
    0
    HAVE A 2018 T 680 KENWORTH,NO POWER TO A/C CLUTCH.All fuses good and proper amount of 134a.Is there a low side psi switch in the clutch circuit somewere
     
    Dieselman81, Jun 30, 2019
    Dieselman81, Jun 30, 2019
    #1
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  3. Jun 30, 2019 #3
    FlyingA

    FlyingA Bobtail Member

    46
    23
    Jun 3, 2018
    Sacramento, Ca
    0
    If same as 2017, should be at firewall passenger side where lines pass into cabin. Also there is a relay under dash cluster.
     
    FlyingA, Jun 30, 2019
    FlyingA, Jun 30, 2019
    #3
  4. Jul 16, 2019 #3
    Freddy2times

    Freddy2times Light Load Member

    64
    31
    Feb 12, 2019
    0
    low pressure switch. can be on low side or as binary switch on high side(low/high switch) you really need electrical schematic for this. would be easier.
     
    Freddy2times, Jul 16, 2019
    Freddy2times, Jul 16, 2019
    #3
  5. Jul 16, 2019 #4
    Expeditor

    Expeditor Medium Load Member

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    530
    Mar 5, 2018
    0
    How did you determined it has proper amount of 134a? It could be low side or high side pressure switch. Also the thermostatic switch on the evaporator, computer, the clutch, many other parts beside the low switch. To answer your question yes, most all have this safety items in place.
     
    Expeditor, Jul 16, 2019
    Expeditor, Jul 16, 2019
    #4
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