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The first place I would check is the seal at the opening of the coolant expansion tank where the airlift adapter goes. I think I had to use the cone shaped adapter as none of the other "regular" ones would fit quite right, even though they were close. So if you are not using the pointy one, that may be the area that is causing you the trouble.
I was able to pull the vacuum and let it sit for about 10 minutes or so with absolutely zero loss of vacuum when I did mine.
If you are sure it isn't the adapter then I would start looking at the areas where you opened the coolant system to see if you can see any air being sucked in, maybe you can spray bottle some water and see if you see any air bubbles or see/hear it getting sucked in?
Steve
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