Pontiac 1998 Trans Sport Owner's Manual page 219

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Heating
Defogging and Defrosting
Turn the temperature knob to the right (toward the red
area) to warm the air.
In the LOWER mode, outside air will be brought in and
sent through the floor outlets. The heater works best if
you keep your windows closed while using it.
The BI-LEV setting is designed for use on sunny days
when the air is only moderately warm or cool. On days
like these, the sun may adequately warm your upper
body, but your lower body may not be warm enough.
For the best results, turn the temperature control knob to
the middle position, and then adjust it for comfort.
If you have the optional engine coolant heater and use it
during cold weather, 0
OF
(-
18
O
C) or lower, your heating
system will provide heat more quickly because the
engine coolant is already warmed. See "Engine Coolant
Heater" in the Index.
To
rapidly defrost the windshield, turn the temperature
control knob all the way to the right (to the red area)
and
turn the mode knob to
DEFROST.
Adjust the fan to the highest speed.
To keep the windshield clear and bring in heated air
through the heater ducts, turn the mode knob
to DEFOG.
When the temperature outside is above freezing, the air
conditioner compressor will run in these settings to help
remove moisture from the air.
Your vehicle is equipped with side window defogger
vents located on the top of the instrument panel. For
additional side window defogging, turn the mode knob
to the BI-LEVEL setting and adjust the fan to the
highest speed. Aim the side vents on the instrument
panel toward the side windows. For increased airflow to
the side vents, close the center vents.
3-4

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