Posted 6/12/2011 20:05 (#1815890 - in reply to #1815740) Subject: RE: Harbor Fr. A/C gauges...no instructions
The schrader valve you refer to is used to purge air from the hose after it is attached to the freon tank. It is common practice to vent a little out that valve to purge the air in the hose before chagring.
Newer and better gauges have a schrader in the hose end or a valve on the charge hose where it attaches to the tank.
INDY
Harbor Fr. A/C gauges...no instructions
