Took it for a look-see with a Toy mechanic. He felt there was no problem with the engine and that the cost to replace is not worth the sensor reset. I had to unplug/replug the check engine sensor in the parking lot of the smog check station to reset. Luckily, the rig passed and the check engine light did not come back on until I drove home, with my CA smog cert passing score.
With my cert in hand, I registered vehicle.
The overheating was likely situational, as many other cars were overheating on the I-5 outside of Vegas. Around town it is functioning just fine, except for a new problem. :\
Twice my Toy failed to start in the Disneyland parking lot, after a few hours in the park. It never failed to start on the trip back from Montana, even when it was really hot from hours of driving or close to freezing.
Eventually, after about an hour of waiting, praying, and trying the ignition, it restarted. Called AAA for a tow and twice cancelled. This happened in the same row of the lot and at night, but not when I parked in other rows. Hmmmmm...
Beware! Bad JuJu in the Disneyland Pinnochio Lot, in the row right next to the parking structure. LOL!