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'73 450SL, '83 300CD, '01 E320 4matic
2,485 Posts
I'd say you have a faulty fan clutch, or your aux electric fan is not working.

I'd do a coolant service with the correct coolant if it's been a while, and replace the thermostat. Cheap insurance.

Make sure the radiator is not gunked up, too. Old high mileage car, if it's the original, it could need a good cleaning.
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