When is coolant temp too hot. About 216

What degree thermostat are you running? A 180 deg. might run a little hot in this weather.Try it again when it cools off a bit. Do you have a 4 blade stock fan or is it a ac car with a clutch fan? Water boils @ 212. Each pound of cooling system pressure raises the boiling point 3 degrees (if I remember correctly.) 50/50 antifreeze also raises the boiling point a few degrees. You're good to around 260. You would have to run it past that for a while before doing any damage. tmm