I need to top off the R-12 in my A/C. I have the small 14 oz cans of R12, a top tapper and charging hose. I know to feed GAS into the low-side while watching the sight glass for bubble reduction. What I don't know is the proper way to hook up the charging hose. Do I tap the can, vent off a little R12 and quickly attach to the low side connection? Is there a better way to purge the charging line? I am trying to avoid the introduction of non-compressible gasses into the system.
Thanks.
got my 609 too :-)