Running high

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Davehrose1, Apr 17, 2024.

  1. Davehrose1

    Davehrose1 Bobtail Member

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    Feb 3, 2024
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    My pete with a paccar seems to be constantly running at 200 or just below. On hills it may go up but the fan goes on and it comes right back down. Is this something I should be concerned about. No warning lights go on.
     
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  3. Bro_Dave

    Bro_Dave Medium Load Member

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    I wouldn't worry. Mine did the same thing.
     
  4. Lazer

    Lazer Road Train Member

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    Nope, nothing to worry about.
     
  5. 201

    201 Road Train Member

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    high plains colorado
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    Judging by the title, I was way off,,but as long as it cools down, heck, we'd run our Big Cams or Macks up to well over 200. HOWEVER,,,it is cooler out now, it may be of concern once temps outside get to be 100. Plugged radiator with bugs is often the culprit, power washes can rip the fins off, so an air or garden hose with low pressure, might be helpful. I'd keep an eye on it.
     
  6. Ridgeline

    Ridgeline Road Train Member

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    bring it to a shop, get them to clean out the debris between the each unit ACA, Condenser and Radiator, it is time for a good cleaning.
     
    201 Thanks this.
  7. Concorde

    Concorde Road Train Member

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    When I’m climbing a mountain I turn the fan on manually when it starts getting up around 190+

    This Cummins and the Paccar I had always ran normally at 181-183.

    I’d take @Ridgeline ’s advice and get everything cleaned up. Seems like an inexpensive place to start.

    Summer is right around the corner and if it’s running at 200 now your auto fan is going to be working overtime.
     
  8. Allhookedup

    Allhookedup Bobtail Member

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    Apr 24, 2024
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    Check for debris in between rad and intercooler as well seen trucks get a piece of plastic or bag up in there before
     
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