Pontiac 1998 Grand Am Owner's Manual page 135

Heating
Defrosting and Defogging
Turning the right control knob to HEATER and the
center CUR^^ knob to the right sends some heated air
through the heater ducts toward your feet, and some
through the defroster vents.
VENT and HEATER are economical positions because
the air conditioner compressor doesn't run in these two
settings. This reduces engine load, resulting in improved
fuel economy. If either setting fails to keep you
comfortable, or causes your windows to fog up, turn the
right control knob to one of the air conditioning
positions,
or to DEFROST.
If you have the optional engine coolant heater (engine
block heater) and use it during cold weather, 0°F
(-
1 8
O
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.
To defrost the windshield, t u r n all three control knobs to
the far right.
The DEFROST setting directs air through the defroster
vents located on top of the instrument panel.
To warm passengers while keeping the windows clean,
use
BLEND.
To defog the side windows, t u r n the right control knob
to
BI-LEVEL and
the fan control
knob
to
HIGH. Aim
the side vents toward the side windows. For increased
airflow
to the side
vents, close the center vents.
3-4