Ranger 4WD L4-140 2.3L VIN A EFI (1997)
Evaporator Core: Description and Operation
The A/C evaporator core is an aluminum core.
The A/C evaporator core is functionally a heat exchanger in which the refrigerant absorbs heat from the surrounding air as it passes over the outer
surface of the core. The refrigerant, when it is delivered through the circuit to the A/C evaporator core, is in a low-pressure liquid form. Then, as a result
of the evaporation process, the liquid is converted to a low-pressure vapor and simultaneously the metal surfaces of the core are cooled.
The A/C evaporator core is a "flooded type" (plate-fin) similar to those used in passenger cars. The condenser to evaporator tube connects to the bottom
of the A/C evaporator core and suction accumulator/drier assembly connects to the top of the A/C evaporator core. The evaporator inlet tube 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 for replacement if it
becomes necessary. However, a special tool, Orifice Tube Remover and Installer D80L-19990-A or equivalent, is necessary to prevent breakage when
removing the A/C evaporator core orifice.
