Expansion Block/Orifice Tube: Description and Operation

A/C Evaporator Core Orifice:

NOTE: The A/C evaporator core orifice should be replaced following A/C compressor failures that produce debris in the system.

The A/C evaporator core orifice has the following characteristics:
^ It is located in the A/C 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-rings on the A/C evaporator core orifice prevent the high-pressure liquid refrigerant from bypassing the A/C evaporator core orifice.
^ Adjustment or service cannot be made to the A/C evaporator core orifice assembly. It must be replaced as a unit.