Fan Clutch Question

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by thaistick, Mar 14, 2018.

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  1. Mar 14, 2018 #1
    thaistick

    thaistick Road Train Member

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    Series 60 Detroit.
    Truck off, key on, the fan should be able to spin freely, yes?
    It does not....
     
    thaistick, Mar 14, 2018
    thaistick, Mar 14, 2018
    #1
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  3. Mar 14, 2018 #2
    beastr123

    beastr123 Road Train Member

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    it depends on whether or not you have air in the system
    the fan system is electric over air and can be a normally open or normally closed and is computer controlled.
     
    beastr123, Mar 14, 2018
    beastr123, Mar 14, 2018
    #2
  4. Mar 16, 2018 #3
    I glide 47

    I glide 47 Road Train Member

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    No when you turn the engine off the fan engages that's normal
     
    I glide 47, Mar 16, 2018
    I glide 47, Mar 16, 2018
    #3
    thaistick Thanks this.
  5. Mar 16, 2018 #4
    Bean Jr.

    Bean Jr. Road Train Member

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    They have them both ways. My truck has an air on fan, so with it shut off, the fan spins.
     
    Bean Jr., Mar 16, 2018
    Bean Jr., Mar 16, 2018
    #4
    thaistick Thanks this.
  7. Mar 16, 2018 #5
    thaistick

    thaistick Road Train Member

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    Sometimes with the truck off and key on I hear air hissing, not all the time...just trying to determine if I need to replace it. Fan does not stay on while running down the road, unless of course I it the override switch.
     
    thaistick, Mar 16, 2018
    thaistick, Mar 16, 2018
    #5
  8. Mar 16, 2018 #6
    Bean Jr.

    Bean Jr. Road Train Member

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    What kind of truck?
     
    Bean Jr., Mar 16, 2018
    Bean Jr., Mar 16, 2018
    #6
  9. Mar 16, 2018 #7
    lwlevens

    lwlevens Medium Load Member

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    Like to know myself I have a 99 Sterling with a detroit 60 and the fan doesn't spin freely also but the fan runs all the time. Don't know if it's the over ride switch,solenoid,or clutch itself.
     
    Last edited: Mar 16, 2018
    lwlevens, Mar 16, 2018
    lwlevens, Mar 16, 2018
    #7
  10. Mar 16, 2018 #8
    thaistick

    thaistick Road Train Member

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    2006 century
     
    thaistick, Mar 16, 2018
    thaistick, Mar 16, 2018
    #8
  11. Mar 17, 2018 #9
    Bean Jr.

    Bean Jr. Road Train Member

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    That it works when the switch is on would point to a problem outside of the clutch itself. Possibly a sensor or some other problem in the control side of the fan.
     
    Bean Jr., Mar 17, 2018
    Bean Jr., Mar 17, 2018
    #9
    thaistick Thanks this.
  12. Mar 21, 2018 #10
    Earlytimes

    Earlytimes Light Load Member

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    Fan will only stay on if temp is above 210f once under that it cuts off unless you hit the fan on switch.
     
    Earlytimes, Mar 21, 2018
    Earlytimes, Mar 21, 2018
    #10
    Bean Jr. Thanks this.
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