System Airflow Description - EATC: Defrost
WARNING: This page is about a different car, the 2004 Ford Pickup, 2004 Ford F550 Super Duty, 2004 Ford F450 Super Duty, 2004 Ford Excursion, and 2004 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
When DEFROST is selected:
- The RECIRC button is disabled. The air inlet door vacuum control motor is at no vacuum, admitting only outside air into the passenger compartment.
- The panel/defrost door and panel/floor door vacuum control motors are at no vacuum, directing airflow to the defroster duct and side window demisters.
- The heater control valve is automatically controlled by the EATC module, based on the temperature settings.
- The A/C request button is disabled. The A/C compressor will operate automatically if the outside temperature is above approximately 6°C (43°F).
- The blower motor is on.
- The auxiliary blower motor (if equipped) is enabled. However, the air cannot be cooled unless the A/C is operating on the main climate control system.