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2002 Freightliner Century Engine fan wont cut off

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by thecubantrucker, Nov 9, 2025.

  1. Nov 9, 2025 #1
    thecubantrucker

    thecubantrucker Light Load Member

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    Good afternoon guys this is a 2002 Freightliner Century with a 60s 12.7 pre-egr. Like the title says was driving home fan turned on during an small uphill wont disengage anymore. I changed the solenoid when parked engine off key off cant spin the blade when i turn on key can't spin it either like it wont disengage or even make a noise. Is there a way to check or do i need to look for power or jump some switches to test ajy help would be appreciated also no codes either.
     
    thecubantrucker, Nov 9, 2025
    thecubantrucker, Nov 9, 2025
    #1
    Flat Earth Trucker Thanks this.
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  3. Nov 9, 2025 #2
    MRMTRANS

    MRMTRANS Medium Load Member

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    Apr 28, 2015
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    Air leak? Either in the airline from the solenoid to the fan. Or in the fan hub itself.
     
    MRMTRANS, Nov 9, 2025
    MRMTRANS, Nov 9, 2025
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  4. Nov 9, 2025 #3
    JB7

    JB7 Heavy Load Member

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    Remove the air line going from the solenoid to the fan clutch. With the air up to 120 turn the key on and see if air comes out. It may be that the solenoid is not getting a signal and not sending air to the clutch. When the clutch gets air pressure it releases it allowing the fan to turn.
    If you have air coming out of the solenoid then check for leaks in the line and at the clutch after reconnecting it.
     
    JB7, Nov 9, 2025
    JB7, Nov 9, 2025
    #3
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  5. Nov 9, 2025 #4
    thecubantrucker

    thecubantrucker Light Load Member

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    So if air doesnt come out then it will be an electrical issue ??
     
    thecubantrucker, Nov 9, 2025
    thecubantrucker, Nov 9, 2025
    #4
    Flat Earth Trucker Thanks this.
  7. Nov 9, 2025 #5
    thecubantrucker

    thecubantrucker Light Load Member

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    Cant hear any
     
    thecubantrucker, Nov 9, 2025
    thecubantrucker, Nov 9, 2025
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    Flat Earth Trucker Thanks this.
  8. Nov 9, 2025 #6
    freebeertomorrow

    freebeertomorrow Heavy Load Member

    922
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    Mar 19, 2016
    Indiana
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    the 2020 mack i used to drive did this. the bracket for the fan wiring harness rusted in half and the wiring fell into the fan. defaulted the clutch fan to always engaged. (electrical issue)
     
    freebeertomorrow, Nov 9, 2025
    freebeertomorrow, Nov 9, 2025
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  9. Nov 9, 2025 #7
    JB7

    JB7 Heavy Load Member

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    Correct.
     
    JB7, Nov 9, 2025
    JB7, Nov 9, 2025
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    Flat Earth Trucker Thanks this.
  10. Nov 10, 2025 #8
    thecubantrucker

    thecubantrucker Light Load Member

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    Jun 2, 2019
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    Ok i did what you asked and yes the solenoid is getting the signal when i turn on the key air goes towards the fan clutch . So that leaves me to think is it the clutch or the hub itself ??
     
    thecubantrucker, Nov 10, 2025
    thecubantrucker, Nov 10, 2025
    #8
  11. Nov 10, 2025 #9
    JB7

    JB7 Heavy Load Member

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    Dec 13, 2022
    Laurel, MD
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    Yes, you are going to have to pull off the clutch and hub. There are videos online on how to rebuild yourself. Don't know what is on there but it may have auto lock which locks the clutch and fan when the friction material is worn out. See this.
    TECH TIPS – Auto Lock | Kit Masters
     
    JB7, Nov 10, 2025
    JB7, Nov 10, 2025
    #9
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