Good afternoon I repair people, my query is the following, air fired from 3000 frig, R22, we told the owner of the house that the previous technician could not load more than 30 PSI in temperate ambient conditions, the air did not cool, changed the robins and nothing, when I called I measured the pressure that pulls the engine in the high-rotor and after 3 minutes did not rise more than 350 PSI, I assumed it was the engine since the team has its good years I change the engine for another one of the same conditions but a newer model than the one I had, I empty it and when I charge gas I always work in vacuum, I could not pass it from 0 lbs, I loaded gas and it went empty, I tried another one of 4500 Frigorías (only to prove) and I did the same, the system is uncovered since I could measure the engine pressure before removing it, what will be the cause ?, thanks for the help [/size]