System Air Flow: Defrost

Fig 1: Identifying Dual Automatic Temperature Control (DATC) Module (DEFROST Is Selected)

Courtesy of FORD MOTOR CO.

When DEFROST is selected:

• The Recirc request button is disabled. The air inlet door actuator positions the air inlet door to admit only outside air into the passenger compartment.
• The defrost door actuator positions the defrost door in the open position and the panel door, floor door, and cold air bypass door actuators position the panel door, floor door, and cold air bypass door in the closed position, directing airflow to the windshield defroster ducts and the side window demisters. A small amount of airflow from the outboard instrument panel A/C registers will be present.
• The dual coolant control valve is automatically controlled by the DATC module based on the temperature settings.
• The A/C request button is disabled. To reduce fogging, the A/C compressor will operate if the outside air temperature is above approximately 2°C (35°F).
• The blower motor is on.