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T600 with N14, engine fan won't turn off

Discussion in 'Trucks [ Eighteen Wheelers ]' started by kogaFX, Apr 9, 2018.

  1. Apr 9, 2018 #1
    kogaFX

    kogaFX Light Load Member

    161
    54
    Jul 19, 2013
    Frozen Lease Road, ND
    0
    Hi, I need help troubleshooting an engine fan that won't turn off. Usually when I start the engine its off but after 30 seconds or so it will turn on even when the engine is cold. A/C is turned off.

    The switch for the fan is in the off position, toggling it doesn't change anything, I checked the fuse and the fuse is good, what should I look for next?
     
    kogaFX, Apr 9, 2018
    kogaFX, Apr 9, 2018
    #1
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  3. Apr 9, 2018 #2
    boneebone

    boneebone Road Train Member

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    Mar 13, 2009
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    Check the fan solenoid which should be mounted above the front engine cover with a air line going in and out of it.
     
    boneebone, Apr 9, 2018
    boneebone, Apr 9, 2018
    #2
  4. Apr 9, 2018 #3
    mrbamcclain

    mrbamcclain Light Load Member

    258
    116
    May 25, 2011
    Hammond, La
    0
    Check the water temp sensor make sure it's good as well. If it goes bad it defaults to "fan on"
    Easiest way to check what's giving it a signal is through Insite. But as said above, your fan solenoid could also be bad. Best way to check that is to remove the power from the switch.
     
    mrbamcclain, Apr 9, 2018
    mrbamcclain, Apr 9, 2018
    #3
  5. Apr 9, 2018 #4
    QUALITYTRUCK

    QUALITYTRUCK Road Train Member

    1,801
    1,762
    Jun 14, 2009
    romulus,mi
    0
    Sounds like high side a/c switch is bad. Insite is best bet to find out quickly. You can turn a/c switch off and you can monitor any temp. sensor that is reading out of range. Ex. your intake temp. might be reading 200 degrees. ECM does not sense a faulty sensor, just thinks that the intake temp. is too high so turns on engine fan.
     
    QUALITYTRUCK, Apr 9, 2018
    QUALITYTRUCK, Apr 9, 2018
    #4
  7. Apr 10, 2018 #5
    kogaFX

    kogaFX Light Load Member

    161
    54
    Jul 19, 2013
    Frozen Lease Road, ND
    0
    So I unplugged the fan solenoid and the fan turned off. Does that mean the solenoid is bad or could it still be the AC or water temp sensors?
     
    kogaFX, Apr 10, 2018
    kogaFX, Apr 10, 2018
    #5
  8. Apr 10, 2018 #6
    boneebone

    boneebone Road Train Member

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    Mar 13, 2009
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    The sensors tell the ECM when to turn on the fan according to the parameters that are set.

    The ECM turns on the fan by energizing the solenoid.

    If the solenoid is staying on, than the solenoid is bad.
     
    boneebone, Apr 10, 2018
    boneebone, Apr 10, 2018
    #6
  9. Apr 15, 2023 #8
    Lucky88!!!

    Lucky88!!! Bobtail Member

    1
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    Apr 15, 2023
    0
    Clutch fan is staying on I’ve changed the solenoid and manual switch it’s on a 92 kw t600 Cummins n14 no ecm
     
    Lucky88!!!, Apr 15, 2023
    Lucky88!!!, Apr 15, 2023
    #8
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