I didn't get that. It sounded like the bubbles were in the rad.
Flushing the radiator probably won't help but considering the age of the VX, it's not a bad idea.
I'm trying to think of anything, other than a blown head gasket that would cause those bubbles. Since his oil is clean, I'm kinda leaning away from the head gasket.
If the lower hose is collapsing when the engine gets hot, that could be restricting the flow to the point that it overheats (boils) and the bubbles are actually trapped air in the system that are just working their way out. Of course, if the thermostat is staying closed then the lower hose could still be collapsing even if there is nothing wrong with it.
http://www.dummies.com/how-to/conten...Id-131604.html
Hey, it's a starting point.
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