Summer sucks. I'm dealing with the same temp creep at speed Tony. I can run all day, AC blasting under 60 mph. Even 65. Break 70-75 and she creeps up to 220-225. Holds steady there but still I don't like it. Maybe touches 230 if I rag on it. Never breaks 210 under any other conditions.

Only thing I haven't personally replaced is water pump and rad BUT both are supposed to be less than 2 yrs old and visually look new. System has been flushed. Twice just to be sure. Never flushed anything nasty out. Just clean coolant.

Grrrrrrr

102 amb today. I ran the first 30 mi home AC off at 75mph she held about 215 then ran the second 30 mi at 65 mph temp stayed ABOUT the same.

I have verified temps with IR gun
Today I ran my OB app to watch temp as well. Was damn close to the gauge.

Hmmmm can't decide what next.
Prob test coolant for exhaust gasses before firing parts canon.