Tube-A/C Orifice: Operation

The fixed A/C orifice tube is used to meter the flow of liquid refrigerant into the A/C evaporator. The high-pressure liquid refrigerant from the A/C condenser expands into a low-pressure liquid as it passes through the metering orifice and diffuser screen of the A/C orifice tube.

The A/C orifice tube is not serviceable and cannot be repaired and, if faulty or plugged, the A/C liquid line must be replaced (Refer to HEATING & AIR CONDITIONING/PLUMBING/LINE-A/C LIQUID - DESCRIPTION) .