Thermal cycle. The heater should be in the lower front hose where it goes directly into the water pump. The heater heats the water and the hot water raises as it is lighter than cold water. This should make the warm water go up through the water pump into the cylinder head and heat the entire engine. This usually works well.
I am assuming you has an Oliver/White tractor. The correct heater has along element that screws into the cast elbow that is below the inlet on the water pump. The correct element is 6-8 inches long so it goes up towards the water pump a good ways.
IS your coolant system full of water??? If it is not then you can have the thermal cycle not work and the block will be cold.
The tank style heaters work with the thermal cycle principle too. There is not a pump in them to circulate the water. Just a check valve in the bottom inlet and warm water raising make them work.
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