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fan staying on while idling , 12' KW T700

Discussion in 'Experienced Truckers' Advice' started by Manny2016, Sep 12, 2016.

  1. Sep 12, 2016 #1
    Manny2016

    Manny2016 Bobtail Member

    6
    0
    Sep 12, 2016
    0
    so i drive a 2012 KW T700, the motor fan used to only come on at 105 degrees, now it stays on when idling regardless of the outside temperatures. I had the solenoid replaced , topped off the coolant and still doing it....Any ideas would be appreciated, thanks.
     
    Manny2016, Sep 12, 2016
    Manny2016, Sep 12, 2016
    #1
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  3. Sep 12, 2016 #2
    northernhopper

    northernhopper Light Load Member

    260
    367
    Mar 15, 2015
    isanti mn
    0
    In my limited knowledge, its only a few things. Fan clutch. Air leak. A/c pressure switch. solonid. Temperature sending unit.
    May be more on newer trucks with more sensors and ecm
     
    northernhopper, Sep 12, 2016
    northernhopper, Sep 12, 2016
    #2
  4. Sep 12, 2016 #3
    Manny2016

    Manny2016 Bobtail Member

    6
    0
    Sep 12, 2016
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    I had a guy replace the solenoid last week and still doing it, thanks for the reply, ill have to take it back and check everything else
     
    Manny2016, Sep 12, 2016
    Manny2016, Sep 12, 2016
    #3
  5. Sep 12, 2016 #4
    STexan

    STexan Road Train Member

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    Oct 3, 2011
    Longview, TX
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    Does it still run continuous when the AC/defroster is off (sleeper and cab)? If turning off the AC stops the engine fan, then you have an issue with the climate control system as noted above. I could be wrong, but in my experience with past trucks, the fan clutch is operated with air. If the solenoid that controls the clutch air stops receiving power, the fan will remain engaged. Several reasons this could be (fuse, sensor, broken wire, etc)
     
    STexan, Sep 12, 2016
    STexan, Sep 12, 2016
    #4
  7. Sep 13, 2016 #5
    snowwy

    snowwy Road Train Member

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    Jul 6, 2009
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    Your fan never came on at temps below 105 degrees before? :)
     
    snowwy, Sep 13, 2016
    snowwy, Sep 13, 2016
    #5
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