ISX coolant temperature go higher the normal

[RTRUCKING48]

I've had the same issue on mine last week while climing a hill it went hotter than normal, changed thermostat and cleaned the radiator and man let me tell you that thing was plugged up with dirt and bugs after that truck came back to normal temperatures, so you may consider cleaning your radiator and 2 years on that thermostat i think you should replace it