Quote:
Originally Posted by robertb1958
Obviously, keeping the cooling system in good shape will help. The wagon I have runs just above 80, dead steady even in the summer with AC. The sedan temp floats between 80 and a little below 100, even in cold weather and with heat on the highway. Sort of tempting to change the thermostat and check the fan clutch? But I have read that others have spent a lot of time & $ chasing this issue without much results.
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Thermal swings are hard on cylinder heads.
Change the thermostat, the plunger is sticking. Or maybe this occurred. Look at my post 5 here
http://www.peachparts.com/shopforum/tech-help/360009-1995-e320-running-hot.html
Fans don't do much above 35 MPH and given it is fine in hot weather, leave it alone.
Also make sure the pressure cap is in good condition. System pressure is critical to prevent boiling in the cylinder head. You will never see this boiling because the bubbles mostly condense before making their way to the rad and you are not looking at the system when the engine is under load.