From thermostat housing to top tank, thru the core, to bottom tank, back to block.
If you really want to test your theory, take a heat gun, and with the tractor hot enough to keep the thermostat open, take the temp of the top tank vs the bottom tank. You will see that the top tank is around 12 degrees or so hotter than the bottom tank. That means the flow is from top to bottom in the radiator.
Now, if coolant flow is low, (bad water pump for example) the coolant spends more time in the radiator and the temp difference will be greater. If the fins are plugged with dirt, the temp difference will be less. (the fan's air flow can't remove much heat)
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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