I have a Ford 1710 that has the exact same issue. I have replaced the water pump, thermostat and radiator. If I start the tractor with the radiator cap off the coolant purges like Old Faithful. If I fill the radiator and leave the cap on it will purge coolant through the overflow tube. I have...
I also have a ford 1710 that will run cool then later climb up to 3/4 towards hot according to the gauge. I have replaced the thermostat, radiator 3 hoses and it has a fairly new water pump. I drained all the coolant out and poured white vinegar in ran it for about 10 minutes and let it stand...