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Fan clutch

Discussion in '6.9L IH & 7.3L IDI Diesels' started by Josh Oldenburg, Nov 30, 2019.

  1. Josh Oldenburg

    Josh Oldenburg Full Access Member

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    When you first start up the engine how long should the clutch stay locked in? I've had other vehicles where the fan unlocks after 30 seconds but the one I have now has stayed locked up after a minute or 2. Haven't ran it long enough to determine if it stays locked all the time. With the engine offnl you can spin the fan with the normal resistance from the clutch

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  2. riphip

    riphip Supporting Member Supporting Member

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    Mine does the same & has for 8 years when replaced. Is a Motorcraft.
     
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  3. Josh Oldenburg

    Josh Oldenburg Full Access Member

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    Unsure. Pull it off of a truck in a junkyard.

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  4. riphip

    riphip Supporting Member Supporting Member

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    Should be fine as long as it has resistance. Mine is a Motorcraft. Tried the Hayden HD but it only lasted about 2 years
     
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  5. Oldiron

    Oldiron Full Access Member

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    What is the bennifit of running the stock, over say flexlite or electric?
     
  6. Cubey

    Cubey Full Access Member

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    My RVs fan clutch felt weak resistance wise but seemed to always spin.

    It ran around 190-195ish on the highway at 55-60 on a flat road. Highest I ever saw was about 210 I think.

    With a new Motorcraft one from rockauto, now it runs about 182ish at 55-60 on a flat highway.

    It got a new Motorcraft thermostat at the same time as the fan clutch since the upper radiator hose had to come off anyway.

    Unfortunately, it seems to have lost about 1mpg hwy from replacing the fan clutch.
     
    Last edited: Dec 1, 2019
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  7. chris142

    chris142 Full Access Member

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    Air flow.
     
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  8. Philip1

    Philip1 Full Access Member

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    Many people find the electric fans do not move enough air to effectively cool the engine where the mechanical is capable of moving more air.

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