[WinDancer]

Didn't have the most enjoyable day with the truck.
The fan temp sensor is between the radiator and the fan assemblies, so I wasn't able to test it.
I removed the first bolt from the thermostat. The second bolt was very tough to turn. I ended up with a cheater bar over the the ratchet handle, and the bolt finally broke off.
After several hours with different plans I gave up and just broke the thermostat housing and removed the problem bolt.
I will go to town tomorrow and see if I can scare up another housing and a bolt, then put everything back together and see what happens with the cooling fan not running.