Cooling systems on old tractors featured heavy cast-iron radiator tanks attached to thick brass cooling cores. Many early models relied on simple thermosiphon cooling systems that circulated water naturally without a mechanical water pump, using temperature differentials alone. These massive cooling systems prevented engine overheating during long summer days spent dragging heavy plow... https://medium.com/@info.tractorfactory/the-evolution-of-the-american-farm-the-old-tractor-story-460ce19fc875