| into the face of the block first, filling the main coolant galley and it flows into the jackets surrounding the cylinders, flowing up through the deck into the heads, and then back to the front of the cylinder heads into the upper coolant pipe. When the thermostat is closed, as the water exits the heads, it makes a u-turn in the upper radiator pipe and enters the thermostat housing. The water pump pulls water through the thermostat housing in all cases. Depending on the position of the thermostat, it will either pull coolant from the upper radiator pipe (recirculation mode), OR, from the lower radiator pipe (cooling mode). The water never flows in the opposite direction - all that changes is where the pump draws water from: either the radiator or from the heads. Granted, it is always a mix of source once the thermostat opens, but it never flows in the opposite direction. The testing you are talking about has nothing to do with flow reversal. The pump moves a large quantity of coolant and it only takes a few seconds for the water in the radiator to exit the heads and affect the reading of the sensor. There is roughly 2.5 gallons of coolant in the entire system. Our water pumps are moving about 15 gallons per minute in the 3000RPM range. You can do the math to figure how many times the coolant makes a loop in one minute.
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