Liberty 2WD L4-2.4L VIN 1 (2005)
Expansion Block/Orifice Tube: Description and Operation
The fixed A/C orifice tube is installed in the of the A/C liquid line closest to the A/C condenser and provides a restriction in the liquid refrigerant line
between the A/C condenser and the A/C evaporator. This restriction established the pressure differential between the high and low-pressure sides of the
A/C system.
Fixed A/C Orifice Tube - Typical
The inlet end of the fixed A/C orifice tube has a nylon mesh filter screen, which filters the refrigerant and helps to reduce the potential for blockage of
the metering orifice by refrigerant system contaminants. The outlet end of the tube has a nylon mesh diffuser screen. The O-rings on the plastic body of
the tube seal it to the inside of the liquid line and prevent the refrigerant from bypassing the fixed metering orifice.
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. It cannot be repaired, and if faulty or plugged, it must be replaced as part of the A/C liquid line.