thanks Tone,

coolant is 50/50, was flushed by Isuzu in Montrose six months ago. Like I stated, only if hot (90-105degrees) going uphill with AC on will I see temps to 207, highest 213, but then turned off AC and back down to 200, flat or going downhill right back to 195....on a hot day. Normal operating, outside 80-90 degrees, runs 179-185 degrees.