Thanks for those details, good info.
If you don't know, there is no sensor to measure coolant temperature. Coolant temperature is inferred from the Cylinder Head Temperature sensor data. IIRC, when I monitored both coolant temperature and CHT, coolant temperature = CHT less 5-7*F under normal operating temperatures. If CHT > 270F, DTC P1299 is thrown, the MIL illuminates immediately and fuel shut-off strategy is activated to reduce engine and coolant temperature. So, there is monitoring and controls in place to protect the engine from damage due to high engine temperature. 231F coolant temp. = about 238F CHT. 238 F is a long ways away from 270F. So, I doubt one would ever get to 270F unless there was loss of coolant or coolant circulation. I've seen coolant temps as high as about 235 -238 F going up steeper, long hills in the West at 75+ mph with temps in the 40's.
I’m not entirely convinced that temps that high won’t warp the head on the ICE, or head gasket issues.
Does anyone know if there’s a set temperature where the cooling fans turn on?