Expansion Block/Orifice Tube: Description and Operation

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 orange
- an orifice diameter of 1.45 mm (0.057 inch)
- is located in the rear condenser to evaporator tube
- 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.
- Adjustment or repair cannot be made to the A/C evaporator core orifice assembly. It must be serviced as a unit.