The thermostat can only do so much. When I was a kid, people used to put a piece of cardboard in front of the radiator. Simple and it works - if it overheats, use a smaller piece of cardboard.

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Houston, Texas
1984 300CD 235K miles, Elvira, one owner
1987 300TD 180K miles
1974 TR6 78K miles Sarah Jane, one owner
OBK #27