Burping a cooling system

[s2per]

I’ve also posted this on Pelican Boxster forum but I’d like to get some additional input.
I just replaced the water pump and t-stat on our ‘06 Boxster Tip. I followed the instructions from Wayne’s book and various other recommendations for filling the system. I was to borrow a vacuum aided filler and it seemed to work well. There appears to be only one 986-style bleeder valve on my car in the trunk.

However, after 6 attempts to get air out of the system, here’s what I have:
No leaks
Heater blows hot air.
The left hose going to the radiators gets hot.
The right hose from the rads and the New 160 degree thermostat are cold.
Fans never turn on.
Tank In trunk remains full.

I have a suggestion from a mechanic friend to put a pressure tester on the tank cap, pressurize and then open the bleeder. But I’m beginning to think I may have to access the radiators and manually get the air out.

I’m open to suggestions!