First tech who looked at it put a tap valve on low side and told me it was about 8 in a vacuum. He added r134a until he had about 4 lbs backpressure. It kinda worked, but not right..cold control shut it off to quick, and it would start again to soon. I know how finicky the charge can be on these things, so I evacuated unit, recharged with r134a 12.7 ounces per nameplate spec, leak checked evaporator, and started unit..still in a vacuum, although only about 2 inches into it I suspect plugged cap tube, but this cap tube is unusual...it seems to be in two pieces...a smaller size cap tube from the filter drier about 2 to 3 foot in length, brazed to a slightly larger size cap tube right before it disappears in to box. Is this smaller cap tube a separate item from the whole cap tube assembly, and can it be ordered by itself?..in the parts lists I have looked at, i see only one size id and length for this box. The brazing of one cap tube to another is the first time I've seen this. Anyone else ever run into a problem like this?