well... i've been thinking about your problem all day....
about the most i can come up with is...
it's not bhg'd... more you have a split or leaking water hose which is sucking in air.. therefore constant bubbles?
have you burped the car?
are you sure it has a bhg?
have you done
- leakdown test
- compression check
- block check
let us know how you get on
