Evaporator Core: Description and Operation

A/C Evaporator Core

NOTE:
- The evaporator core is not separately serviceable. It is serviced only with the evaporator core housing assembly.
- Installation of a new suction accumulator is not required when repairing the air conditioning system, except when there is physical evidence of contamination from a failed A/C compressor or damage to the suction accumulator.

The A/C evaporator core is the plate/fin type.
- A mixture of refrigerant and oil enters the bottom of the A/C evaporator core through the A/C evaporator core inlet tube and moves out of the A/C evaporator core through the A/C evaporator core outlet tube.
- Air from the blower motor is cooled and dehumidified as it flows through the evaporator core fins.

A/C Evaporator Core Orifice

NOTE: A new A/C evaporator core orifice should be installed whenever a new A/C compressor is installed.

The A/C evaporator core orifice has the following characteristics:
- It is located in the evaporator core inlet tube
- It has 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
- The A/C evaporator core orifice assembly cannot be adjusted or serviced. It must be installed as a unit