Creeps up to 105ish..... Last summer during very hot weather (100 F) with AC on and at highway speed, my temps would creep up to between 100 and 110.

I know that a properly functioning cooling system will keep the needle splitting the top circle of the 8 on the temp gauge regardless of OAT or vehicle speed. My system seems to have lost some efficiency, but I can't figure out the cause....

Might have to try throwing parts at it.........

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1994 E320 Wagon, 230,000 miles
1995 E320 Sedan, 106,000 miles
1994 E500 Sedan, 79,000 miles