System Airflow

Fig 1: Identifying System Airflow

Courtesy of FORD MOTOR CO.

The auxiliary A/C and heating system has the following features:

• The auxiliary A/C and heating system is functioning whenever the instrument panel mounted A/C control is in any position except OFF.
• The auxiliary blower motor (18527) recirculates the air inside the vehicle. Outside air is not available to the auxiliary system.
• Air is cooled and dehumidified by the auxiliary A/C evaporator core (19860) only if the instrument panel mounted A/C control is adjusted to a position that requires A/C compressor (19703) operation.
• The temperature blend door and the mode door are controlled by electric actuator motors (19E616).
• Movement of the auxiliary temperature control between COOL and WARM causes a corresponding movement of the temperature blend door to mix air flowing through and around the auxiliary heater core (18476).
• Movement of the auxiliary mode control between PANEL and FLOOR causes a corresponding movement of the mode door to direct air flow between the panel (headliner) registers and the floor duct.