Quote:
Originally Posted by 97 SL320
Removing the core won't make much difference time wise in pulling a vacuum and when you remove the hose, air will enter the system negating the reason to pull a vacuum in the first place.
Long vacuum pulls are to let moisture evaporate / gasses to escape small voids ( like under bolt holes )
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Is this from personal experience having tested it both ways or just theorizing? There are people selling big diameter hoses who run tests with micron gauges hooked up claiming faster evac while achieving lower micron levels with Schrader core removed + big dia. hoses. Are they just trying to sell you stuff?
As for removing the hose and getting air in, that won't happen if you charge with the magic core removal tool (the type with a ball valve) + manifold gauges. Purge the charge hose before connecting to the manifold. When finished charging, install the Schrader core before disconnecting the magic core removal tool.