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Leave the cap loose/off, let it boil, it will not exceed 212F. Keep adding water. Change the stat when you get there. It should be fine and not need fan if moving briskly. Buy a 12v electric fan and strap it to the front of the radiator, run the wires back to one battery, run it...
If it is just a fan issue, you should be fine, just get on the road and drive at a good rate of speed. It it is a thermostat, grab one from a store and head there with some jugs of water and tools. I don't see it being harder than either of these.
Maybe it is not overheating also, and the gauge/sender is flunky. Check for bubbles getting pushed into the coolant, and coolant in the oil (drain 1" of oil from pan). Feel the hoses going in and out of the engine, and temp of the heater, it can tell you more about what is hot or cold with the...