I was lucky in that I was taught by an ASE certified mechanic on how to repair cars and how to service ac system, and who also happens to be my father. I did not learn by trial and error which is what it seems like you are doing.

As for the vote of confidence all I said was that if you don't know what you are doing you could mess up your car or worse you could hurt yourself or someone else. Opening up the wrong valve such as the high side valve while charging can lead to an explosion since the high side pressure is more than what a can of refrigerant can with stand.

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2006 Infiniti G35
2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD
Lotus Europa 1970 Destroyed by fire
Lotus Europa 1970 S2 Renault Powered
Lotus Type 52 1970 Twincam Webers Powered
PORSCHE 911 Targa 1982 The Garage Queen
Audi Avant donated to Kars for Kids
BMW 525IT Sold
Audi 4000CS Quattro Sold
Jensen Healey Lotus Powered Sold
Opel 1900 Sold
Triumph Spitfire 1971 Sold
Triumph Spitfire 1968 Sold
Plymouth "Cuda" 340 Six pack SOLD