GMC 1997 Safari Owner's Manual page 153

Your vehicle has air vents near the center and on the
sides of the instrument panel that allow you to adjust the
direction and the amount of airflow inside the vehicle.
Push the vent up or down to direct airflow to your
preference. Increase or reduce the amount of airflow by
opening and closing the louvers. The vents rotate to
direct the airflow from side to side.
When you close a vent, it will increase the flow of air
coming out of any vents that are open.
If you have rear heating or rear air conditioning, you
will have adjustable vents in the rear of the vehicle to
help direct the airflow. The rear air conditioning vents
are located in the headliner at the rear of the vehicle.
The rear heating vents are located next to the second and
third seat on the driver's side of the vehicle, near the
floor. You can move the vents to direct the flow of air, or
close the vents altogether. When you close a vent, it will
increase the flow of air coming out of any vents that
are open.
Ventilation Tips
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Keep the hood and front air inlet free of ice, snow or
any other obstruction (such as leaves). The heater
and defroster will work far better, reducing the
chance of fogging the inside of your windows.
When you enter a vehicle in cold weather, turn the
blower fan to HIGH for a few moments before
driving off. This helps clear the intake ducts of snow
and moisture, and reduces the chance of fogging the
inside of your windows.
Keep the air path under
the
front seats clear of
objects. This helps air to circulate throughout
your vehicle.
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