Hummer 2007 H2 Owner's Manual page 198

Driver's Side Temperature Knob
The driver's side knob is used to adjust the
temperature of the air coming through the system
on the driver's side. The temperature can be
adjusted even if the system is turned off. This is
possible since outside air will always flow through
the system as the vehicle is moving forward
unless it is set to recirculation mode. See
"Recirculation" later in this section.
Turn the knob counterclockwise or clockwise to
lower or increase the cabin temperature. The
display will show the temperature setting
decreasing or increasing and an arrow pointing to
the driver will be displayed under and to the
left of the temperature setting.
198
Passenger's Side Temperature Knob
The passenger's side knob can be used to change
the temperature of the air coming through the
system on the passenger's side of the vehicle. The
temperature can be adjusted even if the system
is turned off. This is possible since outside air will
always flow through the system as the vehicle
is moving forward unless it is set to recirculation
mode. See "Recirculation" later in this section.
Turn the knob counterclockwise or clockwise
to lower or increase the cabin temperature. The
display will show the temperature setting
decreasing or increasing and an arrow pointing to
the passenger will be displayed under and to
the right of the temperature setting.
The passenger's temperature setting can be set to
match the driver's temperature setting by pressing
and holding the AUTO button for four seconds. Both
the driver and passenger arrows will be displayed.