Another dumb question

[Kw9006nz]

As long as they are refrigerant Orings i have always had green Orings. It seems to me my memory says it has something to do with the pag oil a/c uses. Until you can hold a vacuum for atleast 30min there is leak. Also I change my dryer anytime I lose all my freon or open my system for more than an hour. FWIW pulling a vacuum on the system makes the moisture in the receiver dryer evaporate and evacuates all the 0², which 0² makes the freon less efficient in heat extraction and dissipation