Ford Mustang (1999-2004) Service Manual: System Air Flow Description
MAX A/C
When MAX A/C is selected:
- The air inlet door vacuum control motor is at full vacuum, closing off outside air and admitting only recirculated air.
- The panel/defrost door vacuum control motor is at full vacuum and the panel/floor door vacuum control motor is at no vacuum, directing airflow to the instrument panel A/C registers. A small amount of airflow from the side window demisters will be present.
- Blended air temperature is available.
- The A/C compressor will operate if the outside temperature is above approximately 6C (43F).
- The blower motor is on.
NORM A/C
When NORM A/C is selected:
- The air inlet door vacuum control motor is at no vacuum, admitting only outside air into the passenger compartment.
- The panel/defrost door vacuum control motor is at full vacuum and the panel/floor door vacuum control motor is at no vacuum, directing airflow to the instrument panel A/C registers. A small amount of airflow from the side window demisters will be present.
- Blended air temperature is available.
- The A/C compressor will operate if the outside air temperature is above approximately 6C (43 F).
- The blower motor is on.
PANEL
When PANEL is selected:
- The air inlet door vacuum control motor is at no vacuum, admitting only outside air into the passenger compartment.
- The panel/defrost door vacuum control motor is at full vacuum and the panel/floor door vacuum control motor is at no vacuum, directing airflow to the instrument panel A/C registers. A small amount of airflow from the side window demisters will be present.
- The temperature can be adjusted to heat the air, but the air cannot be cooled below the outside temperature.
- The A/C compressor will not operate.
- The blower motor is on.
OFF
When OFF is selected:
- The air inlet door vacuum control motor is at full vacuum, closing off outside air from entering the passenger compartment.
- The panel/floor door vacuum control motor is at full vacuum and the panel/defrost door vacuum control motor is at no vacuum, closing off airflow to the defrost duct, side window demisters, floor duct and instrument panel A/C registers.
- The A/C compressor will not operate.
- The blower motor is off.
FLOOR
When FLOOR is selected:
- The air inlet door vacuum control motor is at no vacuum, admitting only outside air into the passenger compartment.
- The panel/floor door vacuum control motor is at full vacuum and the panel/defrost door vacuum control motor is at no vacuum, directing airflow to the floor duct. A small amount of airflow from the side window demisters will be present.
- The temperature can be adjusted to heat the air, but the air cannot be cooled below the outside temperature.
- The A/C compressor will not operate.
- The blower motor is on.
FLOOR/DEFROST
When FLOOR/DEFROST is selected:
- The air inlet door vacuum control motor is at no vacuum, admitting only outside air into the passenger compartment.
- The panel/floor door vacuum control motor is at partial vacuum and the panel/defrost door vacuum control motor is at no vacuum, directing airflow to the floor duct, the defroster duct, and the side window demisters.
- The temperature can be adjusted to heat or cool the air below the outside temperature.
- The A/C compressor will operate if the outside air temperature is above approximately 6C (43 F).
- The blower motor is on.
DEFROST
When DEFROST is selected:
- The air inlet door vacuum control motor is at no vacuum, admitting only outside air into the passenger compartment.
- The panel/floor door and panel/defrost door vacuum control motors are at no vacuum, directing airflow to the defroster duct and the side window demisters.
- The temperature can be adjusted to heat or cool the air below the outside temperature.
- The A/C compressor will operate if the outside air temperature is above approximately 6C (43 F).
- The blower motor is on.
Electrical Components
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Refer to Wiring Diagrams Cell 54 , Air Conditioner/Heater for schematic and connector information. Special Tool(s) Connector, Refrigerant Pressure Line 412-093 (T94P-19623-E) ...Other materials:
Control Components (Description and Operation)
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The climate control system heats or cools the vehicle interior depending on
the function selector
position and the temperature selected. Function selector position determines
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1. Verify the customer concern.
2. Visually inspect for obvious signs of electrical damage.
Visual Inspection Chart
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Central junction box (CJB) Fuse 31 (5A)
Damaged wiring harness
Loose or corroded connections
...
Gauges And Warning Devices
Refer to Wiring Diagrams Cell 59 , Generic Electronic Module for
schematic and connector
information.
Refer to Wiring Diagrams Cell 60 , Instrument Cluster for schematic and
connector information.
Refer to Wiring Diagrams Cell 66 , Warning Chime ...