Gary, I have been reading this posting with some interest and have been asking myself what would I do in your situation. My inclination would be to try and determine what the root cause is with some measurements, before removing components, if at all possible. A lot of shops are used to changing things out and following the paths of trial and error that they have been using for years to correct the problem. There must be a better way....
Certainly an IR gun comes to mind as a device to look at surface temperatures. Radiators can be scanned to see if there are indications of poor coolant flow patterns as well as thermastat housings and hoses for abnormal temperatures. Mapping a good working system for the temperature "footprints" vs your problem system would have to yield some differences and hopefully some clues as to the root cause.
Regarding the cooling fan, knowing the fan RPM at certain engine RPMs while the temperature is approaching an overheating condition would be useful knowledge. This profile on your coach vs one that has been cooling effectively would either indicate that the fan hydaulic system is the problem or not. These instruments in the scheme of things are relatively inexpensive nowadays and may yield the information you are looking for to assure that you are fixing the component that is the root cause of your problem. The IR guns are about $100 dollars and this laser tachometer is just over $200.
The IR gun is aimed at a surface to obtain reflected emissivity and the RPM instrument uses a laser and a piece of reflective tape placed on the fan to count revolutions.
I know this is a bit late and the fan motor is now off. I thought that I would pass this along for food for thought for all of us on the forum who might have a future cooling issue.
Just in case the fan motor is not the problem. Perhaps there is another Patriot owner out there that would be willing to map his working system with these instruments. It would serve two purposes, knowing what a working cooling system profile is as a reference for the future and maybe provide Gary with some problem solving insight. Gary, if the fan motor does not solve your problem you may want to consider buying these instruments and finding a working coach owner to profile his cooling system. Hope this helps.
Later Ed
http://www.transcat.com/catalog/productdetail.aspx?itemnum=99037TShttp://www.amazon.com/Raytek-Infrared-Temperature-Gun-RAYST25/dp/B000I2UKB4