Expansion Block/Orifice Tube: Description and Operation

EVAPORATOR CORE ORIFICE TUBE

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

The evaporator core orifice has the following characteristics:
- Color-coded orange
- Orifice diameter of 1.44 mm (0.057 in)
- 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
- Inlet filter screen acts as a strainer for the liquid refrigerant flowing through the A/C evaporator core orifice
- O-ring seals on the evaporator core orifice prevent the high-pressure liquid refrigerant from bypassing the evaporator core orifice
- Adjustment or repair cannot be made to the evaporator core orifice (a new evaporator core orifice must be installed)