so did you fill it with coolant while running during warm-up with cap off to verify the thermostat was open with coolant circulating in the fill neck? if so, you will have seen the bubbles disipate. if not, then there is still air in your system.

 

I believe so. I am going to try to run it around a little more on Friday morning to get any more bubbles out. With the cap off, however, the cooland would expand and dribble over the filler neck. I thought that was the right time to put the cap back on once the bubbles stopped. That might be the reason I had air in the first place, because I didn't do that when I filled it after the rebuild.