Thanks everyone for all your input.

Carl, I will wait for the ice to melt in your neck of the woods so you can send me that pic! We are up to our eyeballs in snow here so it's not like I'm being held up or anything.

From what I gleened from the Hot Sun Industries web site, my panels were upside down all last year, meaning the pipe leaving the panel was at the bottom, not the top so air could have been trapped in the upper corner. Live and learn. In another 100 years, I'll have EVERYTHING figured out.