If you can find a way to flush clean water through it before the radiator goes back on, all the better. Especially if you use vinegar or any kind of flush, the residue needs to be flushed out.
If you can secure the garden hose into the lower radiator hose, pull it up so the water pump is flooded, you can run it while flushing it. But you need to bypass the thermostat to get full circulation. If there is a bypass hose, or a plugged heater hose connection, open that so the water will free flow through the engine. Or take the thermostat out temporarily. If there is a block drain plug, remove that also. It will probably be covered with sediment on the inside, may need to poke it out with a stiff wire.
Once you get water circulating, let it run at fast idle. The flow will soon clear up once the free rust is flushed out. The water will finish draining out the block drain.
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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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