Looks like the cheapest next step is to replace the radiator cap. If my coolant system isn't holding pressure and is boiling at too low a temperature, that could well explain the creeping overheat to ~220f and then sudden spiking to >250f as coolant boils.
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Looks like the cheapest next step is to replace the radiator cap. If my coolant system isn't holding pressure and is boiling at too low a temperature, that could well explain the creeping overheat to ~220f and then sudden spiking to >250f as coolant boils.