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...
Forum Discussion
With the system functioning properly, you will have a distinct temperature RANGE.
First is the thermostatically controlled temperature. With fan speed on low, this is the "rock solid" temperature except under heavy loads/high ambient temperatures.
Once the thermostat is wide open, there will (and should) be a 5-10 degree increase before the fan controller goes to high. If it went to high at or very close to the thermostatically controlled temperature, you would waste a lot of fuel and HP turning that fan on high more than necessary.
Then once the temperature reaches the trigger point for high fan speed, that is exactly what happens.
Very similar to what happens with air pressure with it cycling between cut-in and cut-out PSI.
Brett
First is the thermostatically controlled temperature. With fan speed on low, this is the "rock solid" temperature except under heavy loads/high ambient temperatures.
Once the thermostat is wide open, there will (and should) be a 5-10 degree increase before the fan controller goes to high. If it went to high at or very close to the thermostatically controlled temperature, you would waste a lot of fuel and HP turning that fan on high more than necessary.
Then once the temperature reaches the trigger point for high fan speed, that is exactly what happens.
Very similar to what happens with air pressure with it cycling between cut-in and cut-out PSI.
Brett
