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Things to think about... IMO. COOLING SYSTEM Just won the rig? Study up on the TM's or manuals while waiting for the EUC. Good chance the dealer / sales person NOT going to do a walk around, a test drive or point you to the book in the glove box. Flush the system really good. Rig maybe...

I note your new to forum? Just got a Hummwv? These cooling issues can be learning experience to new owners and old ones too. It always a back and forth when trying to "techno guess" issues thru text exchanges. Based on your deductions, I believe you have narrowed it down. As I said...

Check the thermal switch in the crossover. It applies power to the TDM and on to the Cadillac valve. Sounds like the switch might ?? not be opening to de-energize the TDM and on to the valve. Yes, it works backward from what one might think. Maybe stuck in the closed position (the juice is...

Rev it up a bit. At idle doing the unplug test, it should be easy to see clutch lock up movement. Should hear the fan producing air flow. Rev it up for the big leaf blower action. At cruising speeds (50 or so) when that fan kicks in, you will KNOW it. If not, something still not quite...