Hello All!
With all due respect to those who practice this, i have always wondered about 2 service procedures that are very common in the philippines. I`m not asking to give you guys a hard time, but to just learn from your knowledge and experience, so that i can improve my method of doing basic a/c evacuation and charging for car at home.

1) Vacuuming the a/c for only 1min to 15 mins (some dont even vacuum anymore) prior to charging freon (and thats with a small vacuum pump only). I`m not a technician of course, but why is it that in other countries like the U.S. they charge for 30mins to 1 hour? And to think the Phil has a very high rate of humidity.. Is it maybe to save on electricity and/or wear and tear on the vacuum pump??

I was concerned with this as i myself use just a cheap surplus refridgerator compressure. I do hook up the manifold gauges (just a cheap kind), but dont entirely trust the little vacuum gauge. One day i plan to locate a more accurate vacuum gauge i can have adapted to the vacuum pump line...

2) Charging liquid freon into the system (tank upside down). I understand that doing this speeds up the charging process, but is risky to the a/c compressor (compressor valves i think).

I myself do it the conventional way, with the right side up (charging system with gaseous freon). I`m guessing people charge liquid freon just to speed things up?? Any help on this topic will be appreciated. Thank You!
patrick