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Most Honda's I have dealt with, coolant fan comes on at 205, off at 200. Mind you this was before using a scan gauge, using an Autometer water temp gauge.
FYI: On Honda's up till 2000, the dash gauge does NOT move when the water temps is between 160F and 205F. You could be below the 170F needed to make ECU happy when using the heater in cooler months.
Years ago I wanted to use an RC servo (Futaba S148 or bigger) to control louvers for the grill opening for MPG while cruising as well as airflow below a certain speed, say 30 mph.
That same idea is now used on production cars like the Ford Focus.
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