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Fan goes on and off for no reason ?

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Chris19851985, Oct 13, 2022.

  1. Oct 13, 2022 #1
    Chris19851985

    Chris19851985 Bobtail Member

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    Oct 13, 2022
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    Hello everyone I have a 2005 12.7 century Detroit 60 and recently I am experiencing a wierd problem with my truck and have no clue what it might be ? So basically the fan of the truck is going on when temperature is below 175 f , even when I'm driving empty and outside is cold weather ? Parts been replaced on the truck : fan clutch , coolant tank + temp sensor , solenoid , temp gage at dashboard . The fan goes on and off for no reason mostly when the truck is in motion and temp gage arrow is goind crazy up & down ?? I will appreciate any advice or help . Thank you in advance : Here is a video.
     
    Last edited: Oct 14, 2022
    Chris19851985, Oct 13, 2022
    Chris19851985, Oct 13, 2022
    #1
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  3. Oct 14, 2022 #2
    Star Rider

    Star Rider Road Train Member

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    Check the plug on the temp sensor all of them and look for the terminal that is spread
     
    Star Rider, Oct 14, 2022
    Star Rider, Oct 14, 2022
    #2
  4. Oct 14, 2022 #3
    Rideandrepair

    Rideandrepair Road Train Member

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    Your Truck may have a power distribution module that controls the fan. My 2000 does. It’s located in the fuse panel. Small box with the letters pdmi printed on it.
     
    Rideandrepair, Oct 14, 2022
    Rideandrepair, Oct 14, 2022
    #3
  5. Oct 14, 2022 #4
    supersnackbar

    supersnackbar Road Train Member

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    Your fan is also controlled by your HVAC system. Perhaps one of the pressure sensors on it is telling your ECM to turn on the fan.
     
    supersnackbar, Oct 14, 2022
    supersnackbar, Oct 14, 2022
    #4
  7. Oct 14, 2022 #5
    Chris19851985

    Chris19851985 Bobtail Member

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    Oct 13, 2022
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    Temp sensor on coolant tank you mean ?
     
    Chris19851985, Oct 14, 2022
    Chris19851985, Oct 14, 2022
    #5
  8. Oct 14, 2022 #6
    Chris19851985

    Chris19851985 Bobtail Member

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    Oct 13, 2022
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    Here is a video of the actual problem :
     
    Chris19851985, Oct 14, 2022
    Chris19851985, Oct 14, 2022
    #6
  9. Oct 15, 2022 #7
    Rideandrepair

    Rideandrepair Road Train Member

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    CEL going on and off. Did you pull the blink codes? Are you hearing the fan kicking on and off? Or is there a light on dash when fans on? I can’t hear it kicking on in the video. That’s got to be a loose connection somewhere, causing the gauge to do that. Temp sensor should be on right (passenger) side, on the head. near the back of engine. Between the valve cover and exhaust manifold.
     
    Last edited: Oct 15, 2022
    Rideandrepair, Oct 15, 2022
    Rideandrepair, Oct 15, 2022
    #7
  10. Oct 15, 2022 #8
    Rideandrepair

    Rideandrepair Road Train Member

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    8B275073-A922-4647-9DCA-506F52677B90.png 56235458-0F51-4C17-BF71-1EFADF50FF60.png . #6
     
    Rideandrepair, Oct 15, 2022
    Rideandrepair, Oct 15, 2022
    #8
  11. Oct 15, 2022 #9
    Chris19851985

    Chris19851985 Bobtail Member

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    Oct 13, 2022
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    Yes the fan is kicking for 4-5 seconds when check engine light blink on the dashboard the goes off along with the light !
     
    Chris19851985, Oct 15, 2022
    Chris19851985, Oct 15, 2022
    #9
    baha and Rideandrepair Thank this.
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