Quote:
Originally Posted by Ferdman
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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Re belt tension, from what I gather you tension it until the arrow lines up with the line on the tensioner body, which is what I did.
The thermostat was holding at a perfect 80-ish before the fan bearing work was performed, doesn't seem that it could suddenly be bad now. May replace it anyhow as a process of elimination.