Interesting day repairing my Bonneville
Let me start of by saying, that my problem is solved. Thursday evening, while driving, I was about 20 miles away from home, when I noticed that the temperature needle was gradually rising. It was at 220 and steadly going up. By this time I was no place to pull over to take care of it, so I had to make it home. I made it home. By the time I got there, the needle was all the way to the right as far as it could go, and the "Check Gages" was on the info screen. After getting into it the next morning, I found that the thermostat failed and the pressure was so great that it busted the radiator on the right side on the plastic piece. I took that to the radiator repair shop and had that fixed for $70. It is amazing that a small $5 part can cause such havoc.
I followed the instructions in the tech article by drilling a 3/32" hole in the side of the new thermostat. Once I topped everything off, the temperature has't gone above 200.