The air conditioning system operates on the reheat principal. Reheating the air passing through the system chills the air to an almost freezing temperature. The air reheats to a more comfortable temperature before discharging into the passenger compartment.

Dehumidified air reheats when passing through the heater core in the air conditioning module. The heater warms from engine coolant passing through the tubes of the heater core. The hot engine coolant transfers heat to the heater core fins. The fins then heat the air that flows past them. The relative position of the temperature valve in the air conditioning module determines how much of the total airflow passes through the heater. The amount of reheated air determines the warmth of the total airflow discharged into the passenger compartment.