Expansion Block/Orifice Tube: Description and Operation

A/C EVAPORATOR CORE ORIFICE

AIC Evaporator Core Orifice:

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

The A/C evaporator core orifice has the following characteristics:
- color-coded green
- an orifice diameter of 1.25 mm (0.052 inch)
- located in the condenser to evaporator line
- Changes the high-pressure liquid refrigerant into a low-pressure liquid
- filter screens located on the inlet and outlet ends of the orifice 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.
- Adjustment or repair cannot be made to the A/C evaporator core orifice. A new A/C evaporator core orifice must be installed.