F 350 4WD Pickup V8-351 5.8L VIN H EFI (1997)
A/C Evaporator Core Orifice: Description and Operation
The inlet tube to the A/C evaporator core is fitted with an A/C evaporator core orifice to control refrigerant flow. This A/C evaporator core orifice can be
removed from the inlet tube and A/C evaporator core for replacement if it becomes necessary. However, Fixed Orifice Tube Tool D80L-19990-A or
equivalent is necessary to prevent breakage when removing the A/C evaporator core orifice.
The A/C evaporator core orifice is a restriction between the high and low pressure refrigerant and meters the flow of liquid refrigerant into the A/C
evaporator core. The diameter of the orifice within the A/C evaporator core orifice is 1.575 mm (0.062 inch). The A/C evaporator core orifice can be
identified by the red body color and white outlet tip.
The A/C evaporator core orifice is located in the evaporator core inlet tube and has filter screens on the inlet and outlet ends of the body. The filter
screens act as strainers for the liquid refrigerant flowing through the opening. 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 repairs cannot be made to the A/C evaporator core orifice and it must be
replaced as a unit.
