Air Conditioning Sight Glass. Air Conditioning - Sight Glass Sight Glass - A window in the liquid line to observe refrigerant flow. Also if air is left in the system it will appear as bubbles regardless of the pressure and level of charge.
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Because many newbiesand even some old timers believe if they see bubbles in a sight glass the system is under charged. A sight glass is a tool to observe the refrigerant flow in the liquid line. A clear sight glass on a running system generally means a full line of liquid or totally flat but you would know that.
The refrigerant sight glass is normally located anywhere liquid flow exists and anywhere it can serve a purpose.
A sight glass is a tool to observe the refrigerant flow in the liquid line. If you charge a system properly there is a good chance your going to see bubbles in the sight glass on a 72-78 day. You should never put a sight glass on a residential ac system. Under normal operating conditions the small glass window should appear clear or display a green dot.
