Well the only other thing I had mentioned with a few others is the water pump.
IF that is not it, I am out of ideas.
Assume the radiator is mounted higher than the engine. i.e. no expansion tank on top of the engine. I have seen problems bleeding air on engines with the tank.
To me quick temp swings are air, just a matter of where it is coming from. That is why I keep thinking a cavitating pump, since you have double checked your switches and gauges.
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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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