I finally am able to say the car is running fine and without hassles. I have almost put 200 miles on the car since the new radiator went in with no overheating, and no leaks that I can see. The car actually has a bit of A/C charge left in it to, so the air is cold when I need it to be.

The O2 sensor went out.. not sure about which one yet. Probably the one on the manifold, because that is cracked. It could just be the crack that is causing a poor O2 readout.. who knows.