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 constantly at high speed. Some folks say fine since some ISL's tend to run hot due to variations in how some coach builders install cooling components, etc. The other school of thought is with fan running all the time, my engine may tend to run cooler than needed for optimum efficiency.
I cannot find specs on what is optimal operating temp for the ISL 425 clean diesel engine. Today, pulling my CRV on a short, one hour trip in 70F ambient temps, my Silverleaf shows an average temp of 188 - 192 with a brief period of 195 when climbing a short grade.
Is this generally too cool for the ISL or about right?
2019 Grand Design Solitude 384GK 5th wheel. Glen Allen, VA
