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A/C

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Bernard D, Jun 27, 2020.

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  1. Jun 27, 2020 #1
    Bernard D

    Bernard D Heavy Haul Member

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    A/C only works with engine fan toggle switch on at dash only.
    Replaced 2 sensors that i know of, Hi. and Lo. Sencors.
    ?? Any help would be great thanks.
    2003 PETERBILT 379... C-15
    OLD WERNER TRUCK CONVENTIONAL.
     
    Last edited: Jun 27, 2020
    Reason for edit: Spelling
    Bernard D, Jun 27, 2020
    Bernard D, Jun 27, 2020
    #1
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  3. Jun 27, 2020 #2
    bad-luck

    bad-luck Road Train Member

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    When you say it only works with the manual fan on. Do you mean the compressor only activates with the switch or is only cold with the fan on?
     
    bad-luck, Jun 27, 2020
    bad-luck, Jun 27, 2020
    #2
    God prefers Diesels Thanks this.
  4. Jun 27, 2020 #3
    God prefers Diesels

    God prefers Diesels Road Train Member

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    To add to what @bad-luck said -

    Did you recently buy the truck? If so, the previous owner might have wired it up like that so when you're idling you get enough air across the condenser. Does the A/C work when you're moving, with the fan switch off, or does it only work when the fan switch is on. And what I mean is, will the compressor clutch only engage when the switch is flipped, or will it engage without it, but just blow warm air?
     
    God prefers Diesels, Jun 27, 2020
    God prefers Diesels, Jun 27, 2020
    #3
    bad-luck Thanks this.
  5. Jun 27, 2020 #4
    Bernard D

    Bernard D Heavy Haul Member

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    Good question ,i will have to check that out .
    Ill get back thanks
     
    Bernard D, Jun 27, 2020
    Bernard D, Jun 27, 2020
    #4
  7. Jun 27, 2020 #5
    bad-luck

    bad-luck Road Train Member

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    Baltimore, Maryland
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    Your welcome
     
    bad-luck, Jun 27, 2020
    bad-luck, Jun 27, 2020
    #5
    God prefers Diesels Thanks this.
  8. Jul 1, 2020 #6
    Bernard D

    Bernard D Heavy Haul Member

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    Jun 27, 2020
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    Switch in cab engages compresor.
    Now im not getting cool air just warm air with engine fan engaged.
    Should i look at sensors again.
     
    Bernard D, Jul 1, 2020
    Bernard D, Jul 1, 2020
    #6
  9. Jul 1, 2020 #7
    Bernard D

    Bernard D Heavy Haul Member

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    I had a shop recharge unit about 3 months ago no leaks then idk?
     
    Bernard D, Jul 1, 2020
    Bernard D, Jul 1, 2020
    #7
  10. Jul 1, 2020 #8
    Bernard D

    Bernard D Heavy Haul Member

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    Jun 27, 2020
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    Bernard D, Jul 1, 2020
    Bernard D, Jul 1, 2020
    #8
  11. Jul 1, 2020 #9
    Bernard D

    Bernard D Heavy Haul Member

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    Jun 27, 2020
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    AC started working on its own.
    So this means that the problem coud lie in the sensors?
     
    Bernard D, Jul 1, 2020
    Bernard D, Jul 1, 2020
    #9
  12. Jul 1, 2020 #10
    bad-luck

    bad-luck Road Train Member

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    It's hard to say, thinking it's an electrical problem. Wire, ac relay maybe. It's really difficult to diagnose an issue on a forum
     
    bad-luck, Jul 1, 2020
    bad-luck, Jul 1, 2020
    #10
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