I've had good results with the fan set to turn on when the CHT is around 210*, which I think is equal to the fluid being around 196*? You probably want to set it up so comes on right at the temp where the coolant normally sits. My engine runs at exactly 210* all day long unless towing or traffic, which is why I set my fan to come on only at 210* since thats when the engine's self cooling systems need help.
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2007 F150 Screw 5.4L FX4
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