ISL 'normal' operating temp
This is my first Cummins (had a CAT in previous coach). The pesky, expensive, prone-to-failure, Sauer-Danfoss hydraulic fan control gizmo on my rig is likely failed and my side radiator fan runs cons...
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When you say "clean diesel" I assume you use ULSD fuel. If so, you have the same engine I do, an EPA07 425. Your temp look about normal for the conditions. This engine is designed to run hotter than previous engines for EPA requirements. Out west this summer, with 80 deg temps I routinely saw 200 - 214. My fan kicks in at 210 and the temp goes to 180 and then starts back up when the fan stops. I am now used to temps from 180 to 214 depending on temp, altitude, wind, grade, etc. After five years I have just gotten used to it.
