air dryer purging every 5 minutes

Discussion in 'Ask An Owner Operator' started by peabody747, Feb 6, 2023.

  1. peabody747

    peabody747 Light Load Member

    Jan 1, 2022
    as title says, 2017 kw t680, every 5 minutes it pops obviously when idioling. which I know its not good to idol but that's another story.
    There's no obvious audible air leaks that I can hear so I'm really confused as where to go, im sure I need to change all the filters, been slacking bad on basic maintenance.

    the other issue is when I do shut the truck off I lose about a half a gallon of antifreeze and again no obvious leaks appearing anywhere and I've had it tested and just found the pressure cap bad, I changed that but still losses it.
    You tube university leads ya down all sorts of rabbit holes that probably cost an arm and a leg to repair I'm just looking for simple solutions lol like changing filters?
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  3. zinita17601

    zinita17601 Road Train Member

    Aug 19, 2010
    lancaster pa
    Bad air compressor head,purge your air tanks and check for antifreeze or take the air dryer cartridge off and check there
  4. peabody747

    peabody747 Light Load Member

    Jan 1, 2022
    constantly drain tanks, they dry, yeah was gonna start with cartridge thanks
    Rideandrepair Thanks this.
  5. Gliding ProStar

    Gliding ProStar Medium Load Member

    Nov 12, 2016
    Waxahachie, Texas
    If you are losing coolant and you do not have any visual leaks I would suspect the EGR cooler as the culprit.
    Rideandrepair Thanks this.
  6. Keepforgettingmypassword

    Keepforgettingmypassword Medium Load Member

    Jan 11, 2022
    When you lose coolant, and you pop the top the next morning to refill it. Is there air escaping from the resivour or the radiator cap?

    Have you looked in between your fuel tank and tractor to see if the bunk heator core is leaking?

    Is the anti freeze starting to Change color?

    Can you smell anti freeze randomly?

    Are the braided lines coming off the air comperssor soiled in oil?
    Do you have a side cap on you resoir tank if so is it all the way tight?
    Rideandrepair Thanks this.
  7. Dale thompson

    Dale thompson Road Train Member

    Nov 20, 2013
    commerce twp,mi
    Hmmmm looking for simple fix the air dryer only purges when the governor cycles. Simple explanation is there is an air leak oh and filter changes will not change the rate of air loss.
  8. 86scotty

    86scotty Road Train Member

    Aug 27, 2017
    Every five minutes? Sounds normal. Every minute, not normal.

    Keep in mind, though, idolatry is bad.
    Idling your truck is not as bad.
  9. Old Man

    Old Man Road Train Member

    Apr 3, 2009
    Oklahoma City, OK
    Did you watch the air gauge to see the air leak. Set the trailer brakes and see if air loss slows down. Air dryer cycles when the governor shuts off (redirects air flow)you got a slow air leak.
    Don’t throw money at a new dryer it won’t fix anything
  10. Rideandrepair

    Rideandrepair Road Train Member

    Aug 8, 2015
    Mine did that a few weeks back. Only while idling. I suspected the governor. Wasn’t cold enough to be ice forming in the spitter valve. It did it a couple times, for a while each time, before quitting. Hasn’t since.
    D.Tibbitt Thanks this.
  11. peabody747

    peabody747 Light Load Member

    Jan 1, 2022
    had other eyes on it, the purge valve is stuck open, will fix soon
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