Ok.
I was able to fire up the truck and let it run.
Before start up I placed a clean sheet of cardboard down under the tail pipe. At first I did not touch the throttle. No water from pipe. Now I did not let the truck fully warm up. Could not see any exhaust.
I then revved up the truck some not to much. Water from the tailpipe and could see the exhaust. This continued all the way thru warm up and the fans turning on.
See pictures.

Well on the cardboard there was water with a little soot in it.

I had to know was it water or antifreeze. So I tasted it. No taste-water.

So as suggested I used a temperature gun all around the radiator. Hot at the top and cold down below. One or two spots on the ends at top that were not as hot as everywhere else.
The thermostat was holding its own at 195 degrees. Moving the temp gun around the heads and freeze plugs things looked acceptable.
O yeah the out side temps were in the mid 20's.

If I can borrow the temp camera I will see what it shows.

My plan is to drive it so the old fuel is removed and add fuel- tron additive to the next tank. I all ways run premium.

If any thing else comes up I'll past again.