GMC 2007 Envoy Denali Owner's Manual page 190

(Off): Press this button to turn off the entire
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climate control system. Outside air will still
enter the vehicle, and will be directed to the floor.
Press the AUTO button, the mode button, the
fan arrows, or either temperature knob to turn the
system on.
C
(Mode): Press this button to manually select
the air delivery mode to the floor, instrument panel,
or windshield outlets. The system will stay in the
selected mode until the mode button is pressed
again or the AUTO button is pressed.
Driver's Side Temperature Knob: Turn this knob
clockwise or counterclockwise to raise or lower
the temperature on the driver's side of the vehicle.
The display will show the temperature setting
decreasing or increasing and an arrow pointing
toward the driver. This knob can also adjust
the passenger's side temperature setting if the
two are linked.
Passenger's Side Temperature Knob: Turn this
knob clockwise or counterclockwise to manually
raise or lower the temperature on the passenger's
side of the vehicle. The display will show the
temperature setting decreasing or increasing and
an arrow pointing toward the passenger.
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The passenger's temperature setting can be set to
match and link to the driver's temperature
setting by pressing and holding the AUTO button
for three seconds. When adjusting the driver's
side temperature setting, the passenger's
side temperature setting will follow and both
arrows will appear on the display. The passenger's
side temperature setting also resets and relinks
to the driver's side temperature setting if the
vehicle has been off for more than three hours.
Outside Air Temperature Display
A new outside temperature reading will be
displayed if the vehicle has been off for more than
three hours. If the vehicle has been off for less
than three hours, the old temperature reading may
be displayed because underhood heat is
affecting the true outside temperature. Underhood
heat can also affect the outside temperature
while the engine is running. It may also take
several minutes of driving before the display
updates to the actual outside temperature.