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Engine Fan Runs Constantly.... KW T370 Paccar PX7

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by SilverBulletBand, Aug 11, 2019.

  1. Aug 11, 2019 #1
    SilverBulletBand

    SilverBulletBand Light Load Member

    288
    230
    Dec 15, 2018
    Wetumpka, Alabama
    0
    What would cause the engine fan to run constantly ?

    Also, approximately how many HP is this drawing off the engine ?
     
    SilverBulletBand, Aug 11, 2019
    SilverBulletBand, Aug 11, 2019
    #1
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  3. Aug 12, 2019 #2
    Trucker Kev Paid Tourist

    Trucker Kev Paid Tourist Road Train Member

    1,143
    1,348
    May 14, 2016
    Homer Glen I'll South Chicago suburbs when home
    0
    faulty fan circuit switch..
    probably under normal driving if you had an old fashioned truck where you could kick the engine fan on manually it's probably drawing about an extra quarter of a gallon per mile
     
    Trucker Kev Paid Tourist, Aug 12, 2019
    Trucker Kev Paid Tourist, Aug 12, 2019
    #2
  4. Aug 12, 2019 #3
    lwlevens

    lwlevens Medium Load Member

    623
    427
    Feb 9, 2018
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    I heard somewhere in the neighborhood of 30 to 40 horses...so I heard.
     
    lwlevens, Aug 12, 2019
    lwlevens, Aug 12, 2019
    #3
  5. Aug 12, 2019 #4
    RustyBolt

    RustyBolt Road Train Member

    2,073
    3,333
    Feb 21, 2015
    Bement, IL
    0
    Bad switch, bad fan solenoid, bad fan clutch just to name 3 "could be wrongs".

    Folks can help diagnose the problem if you let them know more about your truck. Edit: helps to read the title.

    But before you do anything make sure you didn't inadvertently bump the switch on the dash. Been there. Done that. Spent half an hour trying to figure it out. Doh!
     
    RustyBolt, Aug 12, 2019
    RustyBolt, Aug 12, 2019
    #4
    Trucker Kev Paid Tourist Thanks this.
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