Cummins ISB 6.7 360 hspwr normal engine temp range

Hello,
I have same engine in 2008 model. On the flats at any outside temp it runs at 192-194. Climbing at 6% for 10 miles it will go to 210 and the fan kicks in and cools immediately to 195. I called Cummins and they said fan on at 210 is the spec. and 192-194 is the thermostat set point. It has been this way since day one.
Hope this helps.
Check the belt for slippage. Check the rad for dirt or obstructions. Check the coolant level and also the rad pressure cap for spring tension and seal condition.