Coach never overheated or anything, I caught the problem when I did a walkaround at Deming NM (I do this every time I stop). I heard all the banging in the rear of the coach. It seriously sounded like I had someone trapped in there and they were taking a bat to the engine compartment.
FL said it most definitely sounds like fan hub assembly. Which, as it turns out, isn't a part you can buy preassembled lol. It's many parts that are purchased separately; "fan hub some assembly required" should be what they call it.
repair was done at cat dealer
Problem now is (oh in addition to towing it), nobody knows exactly which parts are good and which need to be replaced without a 6 hour teardown. I think 6 hours is a bit much; it would probably take ME six hours, but an experienced mechanic should be able to do this much faster. So far, the two techs that have looked at it have both confirmed that they can physically move the fan and the clutch (hub assembly, there is no clutch) so it's a problem between the engine and the fan. Loose bolt? Broken shaft? Failed bearing? Who knows.
About to call FL out here in Phoenix (Tolleson) back and brace myself for cost of each of the 14 or so parts. I figure on one hand, hell, might as well replace EVERYTHING so the clock starts at 0 on the whole assembly.
This forum desperately needs the dollar sign with wings emoticon....