My Cummins stays at one temperature (165) whether I'm pulling the mountains of Montana or the plains of Kansas. If your engine is swinging such as you have noted, then a diagnostic evaluation is in order.
There is no information available, but commonly the cooling system has a thermostatically controlled auxiliary fan. I'd guess that yours is not working correctly.
Cooling problems are one of the few things that can wreck a diesel engine. Better have this checked.
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Safe Travels
Rick
07 TM 40D;ISL 450 Cummins(upgraded). Very happy w/coach
Gnarly toad to scoot around.
Geocaching, hiking, fishing, National Parks, Civil War sites.
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