Thread: Yet another 300SE/300SEL/M103 overheating/coolant change thread
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Old 03-16-2014, 02:35 PM
Ferdman Ferdman is offline
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Join Date: Aug 2002
Location: Southeastern PA
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ThePhoenix, recommend replacing the thermostat. Be sure to orient it properly ... with the vent hole at the high point.

Check the tension on the fan belt because if it is too tight the fan bearing bracket will wear out prematurely. I had that happen on our 1991 300CE when a tech over-tightened the belt. The newer style tensioners eliminate that possibility.
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