So I take it that there should never be air in the pressurized tank? If
exhuast gases are getting into the coolant, is that deffinately the heads
or could it be something in the case as well? I had this happen 2 years ago
(approx. 20k miles) and the tank is becoming over-pressurized again. I just
want to (if at all possible) determine whether it is solely a head problem
or if there may be a problem with the case as well.

Sean B.
'90 V'gon, "Happy Bus", soon to be pseudo Wolfy
Torrance, CA
http://vgonman.vwtrek.com