Cycling fan clutch on 34 or 10 hr break

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Edjahman, Jul 21, 2019.

  1. Edjahman

    Edjahman Light Load Member

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    I've been told that it's bad to let the fan clutch cycle on and off while idling on a 10 hr or 34 hr break.

    Is it really better to just turn the fan on and leave it on?

    It uses a lot more fuel with the fan on, I noticed and I also fast idle at 1100 RPM.

    Thank you!
     
  2. baha

    baha Road Train Member

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    Flip the fan on and it will save wear on fan clutch and keep a/c colder?
     
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  3. 25(2)+2

    25(2)+2 Trucker Forum STAFF Staff Member

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    I haven't had a switch I could turn it on with in a long time.

    Ours all had the fast idle turned down some, the Evolution idles at 850 max. Not all that noticeable when the fan kicks in.
     
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  4. Edjahman

    Edjahman Light Load Member

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    Yeah OK thank you. I was just wondering if it really makes that much of a difference as far as wear and tear goes on the fan clutch.
     
  5. 25(2)+2

    25(2)+2 Trucker Forum STAFF Staff Member

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    Depends on the fan clutch and the idle speed , but the clutch 8s designed for higher rpm than you are idling at, I tried to minimise it by running the AC harder if it was bothering me. Otherwise, I don't worry about it.
     
  6. swaan

    swaan Road Train Member

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    A lot less wear and tear on the clutch to leave it on. And people around you trying to sleep will appreciate it also.
    Nothing worse then a fan cycling on/off all night long when parked beside a guy trying to sleep
     
  7. pushbroom

    pushbroom Heavy Load Member

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    2 speed fan hubs drop the cycle time considerably. 1 speed is drag from magnets, usually enough to keep coolant and a/c in check. Second speed locks in like a normal fan hub
     
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  8. Edjahman

    Edjahman Light Load Member

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    Thank you, everyone!
     
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