Oh, and I didn't write 0 degrees because the ECU interpolates between values.
If you put 0 degrees, at 1 degree it will turn on the fan. This means that at basically any temp, your fans will be on.
I would not personally want them on at all until the coolant temp was high enough to matter, that way when the engine swings up to the temp where the thermostat is opening, it might have some chance of maintaining that temp a little better than it would otherwise.
Again, all arbitrary based off of my own observations, not science.
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