250 F = 121 Deg C - which should still be fine I'd expect, but you're getting close to damaging a head gasket at this temp, probably. I'd avoid letting it get so hot.
Your oil is also probably hotter & quite thin at that temp too...So I'd do an oil change as well as coolant check, etc.
Fans should come on at 100 Deg C, which is around 210 - 215 F. If it doesn't come on, then you need to figure out why...
Keep an eye on the coolant and if it drops, find out why...A pressure test is one way to do so.
I've never tried to connect the two terminals of my temp sensor together for the fan on the SP2 (not sure if there are even any, someone will confirm soon, I expect - but that's a classic way to check for car fans and if they're working or not - rather than letting it get to temp first...
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