Quoting Removed, click Modern View to see1) I remove the bottom radiator hose & insert garden hose into filler neck & see if radiator can flow that much without much running over. Typical garden hose won't flow more than about 25GPM & engine pumps on old engines around 20, newer- 50, modern- 90-135gpm. So, this gives me some indication as to whether or not the core is obstructed. 2) I like to remove the thermostat, re-connect upper hose/housing and insert garden hose into radiator at bottom connection (sealing best possible with old rag) and back-flush both radiator & engine. Open block drain too. As far as boiling fuel.........todays modern blends will boil beginning at about 115F and have a rolling boil at 130F. That isn't much above daytime temps in the southwest, so when running your tractor on modern fuels, you should expect this to occur after it runs long enough to heat the volume of fuel in your tank. Gallon or two, pretty quick. Full tank, longer time to boil. Be cautious in removing cap on hot gas tank.
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