Well, after looking at the service manual it appears that the coolant tank is the high point. So that begs the question, if I have air bubbles how do Bleed the system? I don't really think that's the problem but I didn't see any technique for removing them in the serv. manual or maybe it's late at night and I just didn't read enough information. It's almost 2:00 A.M. though the post time stamp will have it much earlier for some reason. Good Night!