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As above, I'm not at all inclined to mess with the factory setup. So far as I can tell it already minimizes HP loss versus the 1st/2nd Gen trucks (where going to a HORTON fan clutch was a popular mod).
I "know" I might gain 1-mpg in solo, unloaded conditions; and perfroma well even in conditions "difficult" for the drivetrain (almost all of them, including sand, mud, etc); but it is the situations of being loaded and towing, and having to traverse difficult terrain (the above; plus gravel; or hills and mountains, etc) that keep me from wanting to mess with it. Once a diesel gets too hot, it's too late. I've had overheated V8-engines that "recovered" without incident, but I doubt I'd be able to say the same for this level of compression/cylinder pressures.
That said, I don't know as much about the fan operation as I might. I asked for FSM schematic for others, not on my own behalf. I am certain this will be a popular "mechanical" mod for the CTD (versus software ops) . . just not my own, ha! I'll look into the 555 operation at some point.
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