Reply to "Using a vacuum to refill the cooling system. What is the max vacuum, 16#?"

DWR46Member

I think there is some confusion on this subject. Vacuum is measured in "inches of mercury", not lbs/sq in. The vacuum cooling system refill units usually specify trying to pull about 20 in of vacuum. You can usually get fairly close to this number with most refill units. It is enough to collapse large hoses, but not enough to damage anything. The more vacuum you can get on the system, the more complete the refill will be.

7/17/236:52 AM

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