Well, I didn't make it to the Jerky Co. after all. After the glyphs, Rob wanted to show me a horse camp by the cottonwoods - just after the cattle trough leaked into the road and before the Barrel Springs cutoff. You remember, the smoothest part of the trip. We got Dan's message that the group was headed in for lunch but I don't think you heard my reply. We were running about 20 minutes behind. After checking out the camp we started to VC and WAMMO! I hear the fan go into the radiator. I knew immediately because it's not a sound you forget - especially now that I've heard it 4 times! I don't know why yet, I still don't have it home. We strapped over to a friends house in the Highlands and came in. I'm headed out now with the trailer to pick it up.
I'm guessing a motor mount or water pump failure. Rad mounts looked OK, and the spring pins are new OME, but those are the causes that have caused me to hitch-hike in from middle Nevada with a Radiator on my back before.
I think my "experiment" with mechanical fans is over.