Well, my dealer strikes again.
Their lack of a proper and thorough PDI is very evident.
I was poking around under the hood a couple of weeks ago and noticed the coolant recovery tank was bone dry. (Tractor had 34 hours on it at that point). So, popped the radiator cap and noted that the coolant was about 3/4" below the bottom of the neck. Went to the Deere dealer and got some pre-mixed Coolguard and filled up the recovery tank. I've run the tractor about 5 times since then and the level in the recovery tank has not budged, nor has the radiator level. In my estimation it should have taken about two full thermal cycles for the coolant to fill up the radiator.
I've removed the hose from the radiator to the recovery tank and blew through it, bubbles in the tank, so no obstruction there. When I took the overflow hose off the radiator I noted coolant present ,so that does not appear to be obstructed either. I've looked at the cap and no obvious issues that I can see. Cap was and is installed properly. I see no coolant leaks and tractor has never overheated.
First thing to check I guess, is the cap. I guess it could not be allowing any pressure to build up, therefore, no vacuum as it cools off. Anyone's thoughts?