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Quote:
Originally Posted by paul2748
Is the bottom of the radiator the cool spot or the hot spot. I don't know, but if it's the cool spot aren't you getting the wrong readings for the fan.
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At the bottom, the water has already been cooled by making it's pass through the radiator. You need the fan when the water is getting TOO warm, which will be up top where it is exiting the engine, headed toward the radiator at it's warmest temp. You might want to make sure the bung is mounted LOW on the top tank, down close to the core, in case your radiator system likes to keep the water low in the top tank. I think I would also mount it near the RIGHT (Passenger) side inlet, because most flatheads like to run a few degrees warmer on the right side than on the left. But WTH do I know? DD