Pontiac 1997 Grand Am Owner's Manual page 128

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HEATER: This setting brings heated air through
the heater ducts, and some through the windshield
defroster vents.
If you have the optional engine coolant heater (engine
block heater) and use it during cold weather, 0°F
(-
18°C) or lower, your heating system will more quickly
provide heat because the engine coolant is already
warmed. See "Engine Coolant Heater" in the Index.
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BLEND: This setting divides airflow equally
between the heater ducts and the windshield defroster
vents.
DEFROST This setting directs air through the
windshield defroster vents located on top of the
instrument panel.
Climate Control System with
Air Conditioning
Fan Knob
The left control knob sets the fan speed. To select the
force of air you want, turn the knob. The fan is always
running unless the mode control is moved
to
OFF.
Temperature Knob
The center control knob regulates the temperature of the
air coming through the system.
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