What kind of radiator did you get?
On a 300D turbo I had a few years ago Stayed at 80* all year round, then when I had to replace it I got some made in Morroco crap from Radiator.com. It then ran at 100* even in the winter...

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Over 21 years I owned several:
w108
w110
w111
w115
w116
w123
w124
w126
w212