The 100 C running temp sounds normal - especially in the south west. The owner's manual says 120C in traffic is OK too. Bothers me when the engine gets to 120C though. My wagon is in the shop right now for running too hot - about 110C even when it is 75 - 80 F outside.

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dtf
1994 E320 Wagon (Died @ 308,669 miles)
1995 E300 Diesel (228,000)
1999 E300 Turbodiesel ( died @ 255,000)
2006 Toyota Tundra SR5 AC 4X4 (115,000 miles) rusted frame - sold to chop shop
2011 Audi A4 Avant (165,000 miles) Seized engine - donated to Salvation Army
BMW 330 xi 6 speed manual (175,034 miles)
2014 E350 4Matic Wagon 128,000 miles
2018 Dodge Ram 21,000 miles