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 - Good As New - by Bill Goodwin. In the summer of 1995, my father, Russ Goodwin, and I acquired the 1945 Farmall B that my grandfather used as an overseer on a farm in Waynesboro, Georgia. After my grandfather’s death in 1955, J.P. Rollins, son of the landowner, used the tractor. In the winter 1985, while in his possession the engine block cracked and was unrepairable. He had told my father
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