I am not a pro . However , I have found a common leak is the Schrader valves ( like the valve cores in the valve stems of you car wheels ) . There is a tool to remove & replace them with out discharging the refrigerant . I do this as SOP , as preventive maintenance , when a system has a leak .
Relatively inexpensive ( after you purchase the tool ) and painless . The Schrader valves are cheap at a HVAC supply house .
I have another suggestion for you . Send me a private message if interested .
God bless
Wyr
|