Evaporator Core: Description and Operation

The evaporator core is an air cooler and a dehumidifier. As refrigerant enters, it boils, absorbing heat from air being blown through the core by the heater blower motor. This cools the air, which is then directed to the passengers through air ducts. As the air is cooled, moisture in the air condenses on the core and is drained off. The result is cold, dry air. The evaporator core is a serviceable, replaceable item.