Pontiac 1999 Grand Am Owner's Manual page 131

FLOOR: In this position most of the airflow
comes through the floor outlet. The rest of the air comes
through the windshield and side window vents. Set the
center control knob to the temperature desired.
DEFOG: This position divides the airflow
between the floor outlets and the windshield defroster
vent. The air conditioning compressor will run
automatically in this position when it is needed to help
dry the air in the vehicle.
FRONT DEFROSTER: This position directs
most of the airflow through the window defroster vent.
Some of the air goes to the floor outlets. The air
conditioning compressor will run automatically in this
position when it is needed to help dry the air in
the vehicle.
Air Conditioning Compressor Button
Press A/C to operate the air conditioner compressor.
The indicator light will glow when the button is pressed
to indicate that the air conditioning system has been
turned on. The fan knob must be set to a speed.
Air Conditioning
The air conditioner and heater work best if you keep
your windows closed while using them. Your vehicle
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also has the flow through ventilation system described
later in this section.
On very hot days, open the windows long enough to let hot
inside air escape. This reduces the time it takes for your
vehicle to cool down, which should help fuel economy.
On cool, but sunny days, the sun may warm your upper
body, but your lower body may not be warm enough.
-
You can use BI LEVEL with the temperature knob in
the middle and the A/C indicator light glowing. The
system will bring in outside air and direct slightly
warmer air to your lower body.
For normal cooling on hot days, use VENT with the
temperature knob in the blue area and the A/C indicator
light glowing. The system will bring in outside air and
cool it.
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