Expansion Block/Orifice Tube: Description and Operation

A/C Evaporator Core Orifice:

NOTE:The A/C evaporator core orifice should be replaced whenever an A/C compressor is replaced.

DESCRIPTION
The A/C evaporator core orifice assembly, located in the condenser to evaporator tube, has a restriction of 1.46 mm (0.058 inch) that creates the pressure drop necessary for cooling by metering the flow of liquid refrigerant into the A/C evaporator core, thereby reducing the pressure.

OPERATION
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 which cannot be removed from the condenser to evaporator tube. The condenser to evaporator tube must be replaced, or an Orifice Tube Replacement Kit E5VY-19D695-A or equivalent installed, if replacement of the A/C evaporator core orifice is necessary.