That is DEFENITELY too hot for winter time, let alone summer. In the winter I won't even touch 80*C, in the summer I stay around 85*C, 100*C isn't doing the motor any favors better look into that.

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Jeff M.
Mercedes W123 DIY pages are now located here.
1983 / 1984 300D Sold
2000 CLK430 Cabriolet ~58k Sold
2005 Avalanche 4x4 ~66k