Steve
Turns out that our problem is two fold, one is a a faulty fan, it apparently is operating very sporadically. At the slower speeds it is very iffy if it will run and thus not provide the cooling air. The second problem was a loss of cooling fluid due to a leak at the front heater core for the front of the coach. We have lost more fluid than we realized and the repairman bypassed the core, thus eliminating the core from further leakage. We thought we had topped off the fluid, but the loss of fluid was much more than we realized, so after limping into the campground, I checked the reservoir again for coolant and it was needing more fluid. Come tomorrow, I will be making sure the coolant is all replenished. Had Laure pick up an extra four gallons to have on hand. It's hind sight now, but five days ago I could smell coolant fluid at the front of the coach. My teenage and adult experience taught me that if you smell coolant, Find the Leak, which I did not pursue aggressively enough.
So once we get the fluid topped Off this time, we will make a run for the cat facility to have our hydraulics checked to the fan. We will also have the thermostat replaced as advised by Roy Mueller, due to our engine temp reaching 250 degrees, even though it was momentary.
Thanks for your advice and help Steve.
Larry D