cooling fan wont spin

Discussion in 'Trucks [ Eighteen Wheelers ]' started by jmarsh91, Sep 21, 2013.

  1. jmarsh91

    jmarsh91 Bobtail Member

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    Aug 26, 2013
    baxley,ga
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    i ran a hot wire to the air valve and the fan turned on then while i was in the truck i bumped the fog light switch and the fan came on so i figured out the guy that owned the truck before wired the fan switch to the fog light switch instead of the fan switch so thanks for the help every one. now i have just got to figuer out why there is a pipe that goes to the top of the engine all the way down to the ground and blows steam out lol
     
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  3. heavyhaulerss

    heavyhaulerss Road Train Member

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    that pipe if coming from the valve cover, is your blow by tube. it is normal to see some blow by. for Detroits seeing it is mandatory :biggrin_255:
     
    cetanediesel and jmarsh91 Thank this.
  4. jmarsh91

    jmarsh91 Bobtail Member

    46
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    Aug 26, 2013
    baxley,ga
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    how much is to much
     
  5. cetanediesel

    cetanediesel Medium Load Member

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    Albany, NY
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    When it looks like a James Bond smoke screen :biggrin_255:
     
  6. jmarsh91

    jmarsh91 Bobtail Member

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    Aug 26, 2013
    baxley,ga
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    lol it looks like the exhaust of a car on a cold morning
     
  7. cetanediesel

    cetanediesel Medium Load Member

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    Really though, if it puts oil on everything behind it, its time for a rebuild.
     
    Raiderfanatic Thanks this.
  8. heavyhaulerss

    heavyhaulerss Road Train Member

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    just make sure there is nothing blocking the blow by route. no kinks or anything.
     
  9. heavyhaulerss

    heavyhaulerss Road Train Member

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    The fan on a detroit is controlled by the ground connection. not the hot. I was surprised when I found that out
     
  10. jmarsh91

    jmarsh91 Bobtail Member

    46
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    Aug 26, 2013
    baxley,ga
    0
    it dosent spit any oil it just blows steam
     
  11. jmarsh91

    jmarsh91 Bobtail Member

    46
    2
    Aug 26, 2013
    baxley,ga
    0
    that might be the problem on why the fan dosent come on auto cuz its wired up so that the hot turns it on and off
     
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