There are two bypasses that are to be considered. One bypass flows coolant from the water pump to the head. (in your case it might consist of that big hose with an 90* bend from the water pump to the water distribution manifold at the thermostat housing. That action keeps circulating water in the block when the thermostat is closed, preventing hot spots during warm up. The other (I mentioned) bypasses the thermostat, allowing trapped air, and coolant to flow into the radiator without going through the thermostat. It is in the casting where the thermostat is located, and is usually easily found. when looking at the casting mating faces. I know nothing of the engine in your tractor, so my suggestion is to be looked into, not assumed to be there. That setup is interesting. Jim
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