I've made that exact run half a dozen times with Ol' Turbo. For sustained uphill jumps the temperature does rise, and hints at, but never gets above the century mark. I'd be curious how old and nasty the coolant is before diving into parts.

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1985 500SL Euro w/ AMG bits 130k
1984 300SD Turbodiesel 192k
1980 240D Stick China 188k
2001 CLK55 AMG 101k
2007 S600 Biturbo 149k Overheated Project, IT'S ALIVE!!!