GMC 2001 Envoy - Manual (Page 171)

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A/C: This setting cools the air entering your vehicle
and directs most of the air through the instrument panel
vents and a small amount through the floor vents.
BI - LEVEL A/C: This setting cools the air
entering your vehicle and directs it through the heater
floor outlets as well as the instrument panel outlets.
VENT: This setting directs most of the air through
the instrument panel outlets and a small amount through
the floor outlets. The air conditioning compressor is not
working when VENT is selected.
HEATER: This setting directs most of the
warmed air through the heater floor outlets and some
air through the windshield defroster outlets.
BLEND: This setting divides the airflow equally
between the heater floor outlets and the windshield
defroster outlets.
DEFROST: This setting directs most air through
the windshield defroster outlets and some through the
heater (floor) outlets.
Electronic Climate Control System
(If Equipped)
Fan Knob
The knob on the left side of the electronic climate
control panel controls the fan speed. To manually
increase airflow, move the knob clockwise. To manually
decrease airflow, move it counterclockwise.
OFF: If the knob is in OFF, outside air will still enter
the vehicle, and will be directed based on the position of
the mode knob.
AUTO: If the knob is in AUTO, the fan speed will
vary as the system maintains the selected temperature.