A/C Evaporator Orifice Removal
Section 12-00: Climate Control System, Service | 1996 F-150, F-250, F-350, F-Super Duty and Bronco, F-Super Duty Motorhome Chassis Workshop Manual |
The A/C evaporator core orifice (19D990) is a restriction between the high and low pressure refrigerant and meters the flow of liquid refrigerant into the A/C evaporator core (19860).
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 tube body. The inlet filter screen acts as a strainer for the liquid refrigerant flowing through the opening. The outlet screen acts to reduce the noise of the refrigerant flowing through the orifice tube. O-rings on the tube 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. F-Series and Bronco vehicles use a 0.062-inch orifice tube color coded red.
A/C Evaporator Orifice Removal