Hey guys, been having problems ever since the beginning of time keeping my 500E cool.

I've tried JimF's cool harness but it still runs 100C+ in cold weather

I'm wondering if it is my radiator

how do you check, what are signs?

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Own:
2013 C300 4matic
2009 C300 4matic

Owned:
2001 E320 Sport
1992 500E
1989 300SEL