Originally Posted By Andrewh
I have never heard of pulling a vac on the cooling system.
since it is meant to be under 12 to 16 pounds of pressure, I have to ask what was the point?

Some items may not hold pressure /vacuum if they were designed for the opposite.

if you put it under 10 pounds of pressure, does it hold?


That's how the factory filled them and the reason for the lower radiator hose spring.

They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.