GMC 2001 C3, Owner'S Manual

Page: 168 / 388

3-5
Passenger Compartment Air Filter
Your vehicle is equipped with a passenger compartment
air filter, which filters outside air entering the vehicle.
For information on replacing the filter see “Passenger
Compartment Air Filter” in the Index.
Heating
The heater works best if you keep your windows closed
while using it. On cold days, use the floor or bi
-
level
setting with the temperature knob in the red area.
On cold days, approximately 32
_F (
-
0
_C) or lower
you may experience differences in how the transmission
shifts until the engine is warm. This feature
automatically reduces the time it takes for the engine to
reach normal operating temperature and shortens the
time it takes the heater to reach full output.
If you use the engine coolant heater before starting your
engine in cold weather, 20
_F (
-
8
_C) or lower, the
heating system will produce warmer air faster to heat the
passenger compartment.
The use of an engine coolant heater also reduces the
time it takes for the engine to reach normal operating
temperature. For more information, see “Engine Coolant
Heater” in the Index.
Defogging and Defrosting
On cool, humid days, use defog to keep the windshield
and side windows clear. Use defrost to remove fog or ice
from the windshield in extremely humid or cold
conditions. Use defrost with the temperature knob
toward the red area and the fan knob turned all the way
to the right.
Rear Window Defogger
The lines running across the rear window, are the rear
window defogger. The lines warm the glass.
To turn on the rear window
defogger, press this button
below the mode knob.
The rear window defogger
will only work if the ignition
is in RUN. For best results,
clear the window of as much
snow or ice as possible.
The defogger will shut itself off after several minutes.
If you need additional warming time, press the button
again. You can turn the defogger off at any time by
pressing the button.