> (an evacuation test left over
> night will be the best way).

While this is true for our Vanagon A/C systems, it's not always the case.
Ford used a crimp system for connecting A/C components (cheaper than screw
fittings) that was very likely to leak and failed under pressure but not
vacuum!  The system would hold a vacuum just fine but would leak out the
freon charge in a week.

Bill