Is it actually hot by the gauge, or is it blowing coolant out the overflow?
If it's getting hot that quick, sounds like there is no circulation. That can be caused by a defective thermostat, internally clogged radiator, or in rare cases loose or broken pump impeller.
Is the air coming through the radiator hot? If no, there is no circulation. The upper tank should be too hot to touch, the lower tank considerably cooler. Feeling the radiator core, you should feel uniform heat, no cold spots. Cold spots indicate blocked passages.
If the coolant is blowing out the overflow before the temp actually reaches the boiling point, that is an indication of combustion gasses entering the cooling system, as in a blown head gasket or cracked head. Other symptoms are mystery coolant loss, steaming exhaust on a warm day, water condensing in the crankcase, misfire, hard starting as in locked engine when trying to crank.
Early on, not all symptoms will show, it can be difficult to see any, but still it tends to overheat. Try removing the plugs, let sit with pressure on the cooling system overnight. Crank it through and watch for coolant to blow out a cylinder. A combustion leakage test will sometimes be needed.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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