The location of the evaporator core is within the HVAC module and functions as a heat exchanger between the low pressure refrigerant and the air that is entering or recirculating in the passenger compartment. High pressure liquid refrigerant turns to a low pressure liquid by flowing through the TXV just before entering the evaporator. The refrigerant then turns into a low pressure gas by absorbing heat from the air. The heat is then carried by the refrigerant to the condenser for release. Since the air passing through the evaporator core is dehumidified, condensation will collect on the core and then drain to the outside of the vehicle.