Pete 579 intermittent ac 2016

Discussion in 'Peterbilt Forum' started by scoobertdoo, Sep 8, 2021.

  1. scoobertdoo

    scoobertdoo Medium Load Member

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    When I start my truck after it's been sitting for a few days the air conditioning compressor generally will not click on.

    If I park at a truck stop for about 30 minutes after I've been driving a while and turn it back on it will sometimes turn on. If it turns on it will work all day flawlessly. However if I turn the truck back off it typically will not start again.

    I have checked the pressures and can confirm that they are at the high range of filled.

    Any ideas?
     
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  3. GYPSY65

    GYPSY65 Heavy Load Member

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    I have a 2021 and the ac wouldn’t always go back on after turning off the truck

    I talked with Peterbilt and they said to start the truck. Turn everything on. Then turn everything off before shutting off the truck and that would reset the truck

    Not sure if yours is the same but I did that and have turned off my ac before the truck and haven’t had any issues since
     
  4. scoobertdoo

    scoobertdoo Medium Load Member

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    Did they say how long to leave it off for?
     
  5. GYPSY65

    GYPSY65 Heavy Load Member

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    Just everything on then off then turn truck off
    Wasn’t any specific amount of time

    If I remember correctly I think I had to do it a couple times then it reset. Not sure

    But that was over a year ago when I first bought the truck and now I make sure to just shut the ac down before the truck
     
  6. scoobertdoo

    scoobertdoo Medium Load Member

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    That is an incredibly bad design flaw...
     
    GYPSY65 Thanks this.
  7. GYPSY65

    GYPSY65 Heavy Load Member

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    I agree
    I actually talked to one of the regional higher ups and when he told me that I had to comment on what a dumb way to reset the ac

    Seen a video of a guy resetting his warning light by turning the key on and of a certain number of times rapidly

    It worked on the video but again
    Dumb

    Just put a Control Alt Delete button on the dash
     
  8. Dna Mach

    Dna Mach Road Train Member

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    In an automatic, I wait about 15 seconds and then I hear a “clunk” like the transmission is dropping from high to low range. At that point whatever I’m resetting the truck for is usually working again.

    It’s a Peterbilt thing, the AC and dash lights are notorious for having to be reset by turning the truck off and back on. I think the ECM misses sometimes and has to be reset. My 579’s have been good trucks despite these annoying traits.
     
  9. scoobertdoo

    scoobertdoo Medium Load Member

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    That clunk that you hear is most likely the fan clutch releasing onto the fan from a disengage state.
     
  10. Judge

    Judge Road Train Member

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    Always had trouble with my Peterbilt AC, or dash lights going out, had to turn off truck, wait a few minutes turn it back on. C98ECA66-B718-447C-8151-E5741EE9C45E.jpeg
     
  11. scoobertdoo

    scoobertdoo Medium Load Member

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    I've had dash lights goo off one time.
     
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