Evaporator Core: Description and Operation

Air Conditioning

Evaporator Core

NOTE: If an evaporator core leak is suspected, the evaporator core must be vacuum leak tested before it is removed from the vehicle.

The evaporator core is an aluminum plate/fin type and is located in the heater core and evaporator core housing. A mixture of liquid refrigerant and oil enters the bottom of the evaporator core through the evaporator core inlet tube, continues over to the plate/fin sections and then moves out of the evaporator core through the evaporator core outlet tube as a vapor. Airflow from the blower motor is cooled and dehumidified as it flows through the evaporator core fins.