Expansion Block/Orifice Tube: Description and Operation

Air Conditioning

A/C Evaporator Core Orifice

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:

- It is located in the evaporator core inlet tube
- It 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 bypassing the A/C evaporator core orifice
- The A/C evaporator core orifice assembly cannot be adjusted or serviced. It must be installed as a unit