Pontiac 1999 Firebird - Manual (Page 148)

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Comfort Controls
With this system you can control the heating, air
conditioning and ventilation in your vehicle.
Your vehicle also has the flow - through ventilation
system described later in this section.
Fan Control Knob
Turn the fan knob to select the force of air
you want.
Temperature Control Knob
Turn the center knob to change the temperature of the
air flowing from the system. Turn it toward the red
(clockwise) for warmer air and toward the blue
(counterclockwise) for cooler air.
Air Control Knob
OFF: The system is off.
MAX: Provides maximum cooling or quick cool - down
on very hot days. This setting recirculates most of the air
inside your vehicle. If it is used for long periods of time
the air may become dry. This setting directs air through
the upper air vents.
A/C: Use for normal cooling on hot days. This setting
cools outside air and directs it through the upper air vents.
The air conditioner compressor operates in MAX, A/C,
bi
- level, blend and defrost when the outside temperature
is above freezing. When the air conditioner is on, you
may sometimes notice slight changes in your vehicle’s
engine speed and power due to the operation of
the compressor.