Pontiac 1999 Firebird - Manual (Page 149)

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BI - LEVEL: Air is directed through the upper air
vents and the heater ducts.
VENT: Air flows through the upper air vents.
HEATER: This setting directs most of the air
through the heater ducts and some of the air through the
windshield defroster vents.
BLEND: Air is directed through the windshield
defroster vents and the heater ducts.
DEFROST: This setting directs most of the air
through the windshield defroster vents and some of the
air through the heater ducts.
Cooling
The air conditioner works best if you keep your
windows closed. On very hot days, open the windows
just long enough for the hot air to escape.
1. Turn the air control knob to A/C for normal cooling.
For faster cooling turn the knob to MAX.
2. Turn the temperature control knob to a
comfortable setting.
3. Turn the fan control knob to the desired speed.
Heating
The heater works best if you keep your windows closed
while using it.
1. Turn the air control knob to heater.
2. Turn the fan control knob to the desired speed.
3. Turn the temperature control knob to a
comfortable setting.
During initial start - up only, if your vehicle is equipped
with an optional engine coolant heater, you can use it in
cold weather (around +20
_F/ - 8
_C or lower) to improve
heater performance on initial start up. See “Engine
Coolant Heater” in the Index.
Bi-Level Heating
You may want to use bi - level heating on cool, but sunny
days. This setting directs cool air toward your body and
warmer air toward your feet.
1. Turn the air control knob to bi - level.
2. Turn the temperature control knob to a
comfortable setting.
3. Turn the fan control knob to the desired speed.