A sure way to tell if there is circulation, with the engine up to operating temp, the air coming through the radiator should be hot.
You should also find the upper tank and hose to be hot, the lower tank and hose cooler.
It's rare for a pump to loose the impeller, but it happens. If the radiator is cold, even with the engine up to temp and the RPM up, there is no circulation.
Are there any other symptoms along with the overheating?
Sounds like you have about covered all the bases, good chance there may be a head gasket or cracked head problem, especially if this started following an initial overheat incident.
Typical symptoms are steaming out the exhaust even on a warm day, mystery coolant loss, misfire, blowing coolant out the overflow even before the engine is to the point of boiling, coolant or watery froth in the oil, under the oil cap, on the dipstick. Diagnosis can be tricky, especially if the leak is very small.
There is a test for combustion gases in the cooling system. It samples the air in the top of the radiator, the fluid changes color if combustion gasses are present. Check with Autozone, they may have it in their loaner program.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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