Nothing wrong with the cooling system, just these failsafe thermostats are for the birds.
This is what NAPA says about them and I agree - NAPA Heating/Cooling
I bet I only got to 220 because of a little air (in less than 5 miles driving), topped off with coolant, then it wouldn't heat up quickly. I guessed right, took it apart and 2nd one stuck open. These things are junk. A Jeep can easily get to 215 or 220 on occasion and not really have anything wrong (mudding, AC running, hot days, towing, etc.) That I do not consider overheating and these failsafe thermostats should not open and clip open permanently at that temperature.
Took two back to autozone and since I had receipts they covered them and gaskets and they are not cheap $14 ea. plus gaskets $4 each. Still a pain to take apart, lose some coolant, refill, scrape off old gasket, wait for new gasket goop to cure, etc.