Evaporator Core: Description and Operation

Evaporator Core
The aluminum evaporator core is located along the right-hand side of the cowl, and is the actual cooling unit of the system. The blower forces air through the evaporator core, where it is cooled and dehumidified. Condensation, which collects on the cold fins of the condenser, is drained from the housing through a small hole in the module bottom. Unlike a radiator which transfers heat to the air flowing through it, the evaporator core absorbs heat from the passing air. This is how the air is cooled. The heat that is absorbed from the air causes most of the refrigerant to boil into a vapor.

This vapor then flows out the top of the evaporator and into the accumulator, carrying with it some liquid refrigerant and refrigerant oil.