The HVAC unit is installed out of sight of the occupants under the vehicle's instrument panel. The Proportions of fresh air and recirculated air from the drawn-in air are controlled by flaps. The flap is controlled by Intake Acutator installed on Air inlet duct before the fan. The Intake Actuator consists of actuator motor, and potentiometer. A/C control module controls actuator motor and receives feedback signal from the potentiometer to calculate the position of the flap.