Ford 2003 Mustang Workshop Manual page 3044

9 19D990
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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 6°C (43°F).
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.
A/C evaporator core orifice
A/C evaporator core
Low pressure vapor
High pressure vapor
Low pressure liquid
High pressure liquid