Ranger 2WD V6-245 4.0L VIN X SFI (1997)
A/C Evaporator Core Orifice: Description and Operation
The A/C evaporator core orifice is a device which provides a restriction between the high- and low-pressure segments of the refrigerant circuit and
meters the flow of liquid refrigerant into the A/C evaporator core. Temperature is controlled by sensing the pressure within the A/C evaporator core with
a pressure operated electric switch. The pressure switch controls A/C compressor operation as necessary to maintain the pressure within specified limits.
The A/C evaporator core orifice is constructed with a plastic body, two screens and a small brass tube down the center of the body. Two O-rings are
around the body to seal against leakage.
The A/C evaporator core orifice is located in the inlet tube and has a filter screen on the inlet end of the body. The filter screen acts as a strainer for the
liquid refrigerant flowing through the opening. O-rings, on the body, 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. The replacement A/C evaporator core
orifice must have a 0.067-inch orifice and be color-coded blue.
