I'm no expert at this but I have some links for you. I'd read through them to see if the 'setup' applies to your situation. If not, you may want to consider ctcing the mfgr.
Bleeding Radiators II, and Bleeding Radiators III.
My best to ya and hope this helps.
Jay J -Moderator
PS: God Bless America!
© 2016 Renovate Your World LLC