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COMON YOU GUYS!! figer sumthin out out us knukel draggers can just bolt up.



My sentiments exactly.
All this talk of PWMs, controllers, relays, etc., is way over my head.



I was told there would be no math



No math on your end

You'll have to hook up power, ground, the temp sensor, and the trigger wire to the fan. Turn two knobs to set the on and full speed temp, and forget it.

I on the other hand... I get to read the two temps you selected, then figure out how to increase the PWM duty cycle linearly from one to the other. The PWM itself is handled in hardware, so I just tell it what duty cycle to generate

But now, at least for my own personal controller, I'm thinking of giving it a temperature (ie, 200*F), and letting the fan vary speed to maintain that temp (within reason of course).



do you actually have a scale on the knobs, or are you guessing?

Do not set the fan to stay on.
when moving it will actually inhibit air flow.

I can tell when I hit the freeway with the fan running, my temps are higher than if the fan is off. That is why I mentioned a speed sensor. To make sure it cuts off when moving.
I have thought of a manual switch before, but woe und to him that forgets to flip it back on when leaving the freeway after a high speed run and gets stuck in stop and go traffic.