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Peterbilt 389 noise from a/c behind dash.

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Youngtrucker91, Sep 26, 2017.

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  1. Sep 26, 2017 #1
    Youngtrucker91

    Youngtrucker91 Light Load Member

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    I have a peterbilt 389 pride and class bought it from Fitzgerald about 3 months ago I been hearing this ticking noise that only starts when I turn on my a/c noise seems to be coming from the back of the dash board at least I think it does i took it to peterbilt about 6 times and they keep giving me all this excusesand they have change parts and still no luck.any can help I would really appreciate thanks
     
    Youngtrucker91, Sep 26, 2017
    Youngtrucker91, Sep 26, 2017
    #1
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  3. Sep 26, 2017 #2
    Youngtrucker91

    Youngtrucker91 Light Load Member

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    Sorry phone no working properly lol
     
    Youngtrucker91, Sep 26, 2017
    Youngtrucker91, Sep 26, 2017
    #2
  4. Sep 27, 2017 #3
    Goodysnap

    Goodysnap Road Train Member

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    Its most likely just the A/C clutch relay. Does the system contain the correct amount of refrigerant? Rapid clutch cycling can occur with a low or overcharged system. Other than relocating the relay to a different location, I'm not sure there is an easy resolution to your issue.
     
    Goodysnap, Sep 27, 2017
    Goodysnap, Sep 27, 2017
    #3
    Youngtrucker91 Thanks this.
  5. Sep 27, 2017 #4
    Youngtrucker91

    Youngtrucker91 Light Load Member

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    Yes peterbiilt check the freon on the truck every thing is at the right level now how does relocating the relay work??
     
    Youngtrucker91, Sep 27, 2017
    Youngtrucker91, Sep 27, 2017
    #4
  7. Sep 27, 2017 #5
    cnsper

    cnsper Road Train Member

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    Could also be something in the duct work
     
    cnsper, Sep 27, 2017
    cnsper, Sep 27, 2017
    #5
    Youngtrucker91 Thanks this.
  8. Sep 27, 2017 #6
    Goodysnap

    Goodysnap Road Train Member

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    The relay is right behind the gauge cluster and quite close to the driver. If you move it farther away and or insulate or wrap the relay it will be less noticeable. Just have to run the wires wherever you wanna move it to. Turn the radio up? Lol .....Proly not the answer your looking for is it?
     
    Goodysnap, Sep 27, 2017
    Goodysnap, Sep 27, 2017
    #6
    Youngtrucker91 Thanks this.
  9. Sep 27, 2017 #7
    Youngtrucker91

    Youngtrucker91 Light Load Member

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    I'll just take it to a different peterbilt see what they say hopefully they have the better solution
     
    Youngtrucker91, Sep 27, 2017
    Youngtrucker91, Sep 27, 2017
    #7
  10. Oct 1, 2017 #8
    Rackpass 85

    Rackpass 85 Light Load Member

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    Check your filters also make sure they were installed correctly!
     
    Rackpass 85, Oct 1, 2017
    Rackpass 85, Oct 1, 2017
    #8
    Youngtrucker91 Thanks this.
  11. Oct 1, 2017 #9
    Youngtrucker91

    Youngtrucker91 Light Load Member

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    Ok thanks
     
    Youngtrucker91, Oct 1, 2017
    Youngtrucker91, Oct 1, 2017
    #9
  12. Oct 1, 2017 #10
    Rackpass 85

    Rackpass 85 Light Load Member

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    Unfortunately not everyone psys attention to how they an can be sucked in to fan if not done right! Personal experience! Wont name dealer but in Springfield, Mo
     
    Rackpass 85, Oct 1, 2017
    Rackpass 85, Oct 1, 2017
    #10
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