Quote:
Originally Posted by wildest
I've been told that pulling a vacuum for several hours (pump on for that long) makes sure to get out any residual moisture in the system. I do that, but can't verify that it's imperative. Leaving a system with a vacuum seems better that releasing it if it's just going to sit for a few days. That would pull moisture back into the system.
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You are correct in all this.
If you read most any auto a/c manual it will tell you to pull a vacuum better than 20 inches for 30 minutes before charging. I have always considered this to be enough to make the system WORK, but not arly negood enough to remove enough moisture to prevent corrosion.