No air to seats, cab air bags, defroster

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by red_fern, Jun 25, 2022.

  1. red_fern

    red_fern Bobtail Member

    2
    2
    Dec 8, 2021
    0
    Hello to all, I have a 2007 fld120 classic that has been sitting for a bit and when I started her up the seats and cab air bags will not air up, no air to the fifth wheel lock either. the truck builds pressure fine and the air brakes are good, just seems like there is no air to all of the accessories.
     
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  3. Star Rider

    Star Rider Light Load Member

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    Sep 23, 2019
    Michigan
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    Sounds like a bad pressure protection valve. There are quite a few kinds , google it. Usually mounted on an air tank.
     
  4. AModelCat

    AModelCat Road Train Member

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    Jul 7, 2015
    Canuckistan
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    ^^^^ 2nd this!
     
  5. red_fern

    red_fern Bobtail Member

    2
    2
    Dec 8, 2021
    0
    Awesome, I've located it on the rear of the driver side tank and I'll make moves to replace it, thanks guys!
     
    Star Rider Thanks this.
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