Coolant temperature at idle

The northstar motor is self purging. Would there still be air in the system?

And i took out the thermostat and tested it in boiling water. It opens....

You may have the Northstar curse. Head bolts pull out causing leaking head gaskets.

That high temperature reading might just be a false reading from a bad temperature sensor. Take an infrared temperature sensor tool and take a reading off the cooling system, maybe near the thermostat or upper radiator hose.

Purge lines clogged maybe???

Are both cooling fans operable?

Yes they are and they do turn on

Checked purge lines. They are all clear