Purging with Nitrogen doesn't seem to complicated. Open the low side port to the outside, inject Nitrogen on the high side port and flush for awhile. Close the low side port and add Nitrogen until the pressure is ? 20 psig and close everything up. Then I check for the gauges reading lower over the n...

In the forum archives there is a thread on this for a car like mine where the two condensers were added/etc. The guy is in exactly the same place I'm at this point.

Line Purge & pressure test procedue with Nitrogen
mthomas58 on Thu April 03, 2008 2:23 PM User is offline

I can get a bottle of compressed Nitrogen pretty easy around here - not sure of the needed size but they are in the range of $35.
I assume when the shop hooks up to my system to evacuate the left over Nitrogen will not cause any issues.
I need to read up on purging with Nitrogen.

I can imagine the venturi pumps can't pull much of a vacuum.
Should I pressurize with compressed shop air? Should I get some nitrogen?
The system is "empty" at this point - only ambient air and oil in the compressor.
Thanks.

OK - all is assembled. Multiple flushings of the new compressor and then filled with 5.75 fl. oz. of DEC PAG 45. I spun the compressor in case we forget when doing the evac. and fill. The shop loaned me a venturi pump and I bought a HF gauge set. I'll try my hand at pulling a vacuum and see if I hav...

No need to get mean! I'm planning on putting the compressor in today using DEC PAG 46. That's the last item.
Above we see bohica2xo recommend using a micron gauge and now it is recommended as not needed.
Maybe you two can hash it out while we watch/listen.

How would you approach a tech. that is touted as a master auto. tech. but doesn't have a micron gauge? So far I haven't been able to locate a shop that uses an electronic vacuum gauge near where I live (Silicon Valley CA). I've talked to the guy and he seems reasonable and willing to tackle the evac...

I think we've established that.

Holes don't go through (thru) , it seems they are there for the reason I mention.
Still, should I look at finding better converters that have bigger Schrader valves and/or brass caps?
Thanks.

They came that way - I had the same question. I'll take a closer look to make sure the holes don't go thru. I think those "holes" are to get a more constant wall thickness for the center part of the cap that has the male threads that thread into the top of the fitting. It helps with the mo...