Expansion Block/Orifice Tube: Description and Operation

NOTE: A new A/C evaporator core orifice should be installed whenever a new A/C compressor is installed.

The A/C evaporator core orifice has the following characteristics:
- Is color-coded orange.
- Has an orifice diameter of 1.45 mm (0.057 inch).
- Is located in the aft condenser to evaporator tube.
- Has filter screens located on the inlet and outlet ends of the tube body.
- The inlet filter screen acts as a strainer for the liquid refrigerant flowing through the A/C evaporator core orifice.
- O-ring seals on the A/C evaporator core orifice prevent the high-pressure liquid refrigerant from by-passing the A/C evaporator core orifice.
- Adjustment or repair cannot be made to the A/C evaporator core orifice assembly. It must be installed as a unit. This requires installation of the condenser to evaporator tube or installation of the Evaporator Core Orifice Replacement Kit.