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You should probably set it a bit higher than you have it. My car turns on the fan 10°F above the t'stat fully open temperature, and turns it off around t'stat +3°F.
The radiator fan should come on only very seldom. If it's still on all the time after you raise its set point, then you need to open more of your radiator grille. If it never comes on, then close more of your grille.
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