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Sounds like julied has fresh water cooling, as it was mentioned that the coolant level was checked. How was the accuracy of the temperature guage checked? Also, maybe the thermostat isn't sealing well so enough water leaks by to keep it from warming up? I frankly don't think that running at 150 degrees vs. 170 degrees will make that much of a difference, but I'm a backyard mechanic, not a diesel expert.
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