Evaporator Core: Description and Operation

NOTE: Whenever an A/C evaporator core is replaced, also replace the suction accumulator/drier.

The A/C evaporator core is the plate/fin type with a unique refrigerant flow path.
- A mixture of refrigerant and oil enters the bottom of the A/C evaporator core through the A/C evaporator core inlet tube and is routed so it flows through the partitioned first three plate/fin sections.
- The next four plate/fin sections are partitioned to force the refrigerant to flow toward the other end of the A/C evaporator core.
- Refrigerant then continues over to the remaining five plate/fin sections and then moves out of the A/C evaporator core through the A/C evaporator core outlet tube.
- This S-pass flow pattern accelerates the flow of refrigerant and oil through the A/C evaporator core.