During my 3,300 mile journey last month my engine temperature suddenly started to climb during a few of our driving segments. Fortunately I have installed the fan controller by-pass switch on my control panel so I was able to switch my fan to high as needed. During most of this trip the fan would go into high speed at 207 degrees and switch to a lower speed at about 200 degrees. I was able to track this as I can hear the fan when it's on high. The fact that this happened very inconsistently lea