After it had been driven several miles, and is completely warmed up, the system should have pressured up. You should be able to squeeze the radiator hose and feel the firm pressure. If there is no pressure, the cap is bad.
If there is pressure, that is the time to look for a leak. It will probably be a very small leak, could be difficult to find. Look around all visible fittings, the water pump weep hole, radiator seams, etc. A leaking heater core will usually show up as wet carpet or unusual steaming of the windshield. It could even be a leak above the liquid level, leaking only steam vapor.
There is always a possibility it could be a head gasket. But unless the engine has been hot, that is not a real likely cause.
Probably going to find a loose hose clamp. As new as it is, and low mileage, not likely it is anything deteriorated from heat or age.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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