Quote:
Originally Posted by Brian Carlton
If it is any consolation, I have the exact same vehicle and it, too, runs close to 100C. whenever it feels like it. I, too, have replaced everything but the sending unit. Nothing affects the result.
My infrared thermometer does show a slight benefit............93C. on #6 when the gauge shows 100C.
I'm tired of worrying about it..........the engine doesn't care if it runs warm (actually preferable for fuel economy).........why should I?
With a 50-50 mix of Xerex and a pressure of 15 psi, the boiling point is 128C. and the engine can run safely right to 120C. without any issues.
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Thanks for that. That actually does offer some consolation, as do all the other posts of people with 300D/SDs running at or near 100C. If I wasn't so OCD, I propably wouldn't even be worried in the first place... Interestingly, the FSM says that the water/coolant mix comes from the factory at 55%/45% by volume, respectfully. While a 5% difference in watever vs. coolant isn't much, it does suggest that running a mix of slightly more water than coolant might be advisable.
I tend to believe that my higher temperatures are part of my increased fuel economy as well. My engine runs great -- much better than any of my friends with the same engines, and I get the best MPG to boot.
I get similar results in my 7.3L F-350 with a higher 203F thermostat. Putting in the higher temperature thermostat in that truck immediately raised the fuel efficiency by 2 MPG.
Quote:
Originally Posted by qwerty
I have a known good Wahler thermostat if you want it. It kept my 300D at 85 degrees under normal operating conditions. (I replaced it on principle in conjunction with a new radiator installation.)
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