GMC Yukon Denalid Owner's Manual page 215

Driver's Side Temperature Control
The driver's side temperature buttons are 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.
Press the + or − buttons to increase or decrease
the cabin temperature. The driver side
temperature display will show the temperature
setting decreasing or increasing.
Passenger's Side Temperature Control
The passenger's temperature buttons 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.
Press the + or − buttons to increase or decrease
the cabin temperature. The passenger side
display will show the temperature setting
decreasing or increasing.
The passenger's temperature setting can be
set to match the driver's temperature setting by
pressing the PASS button and turning off the
PASS indicator. When the passenger's
temperature setting is set different than the
driver's setting, the indicator on the PASS button
will illuminate and both the driver's side and
passenger's side temperature displays will be
shown.
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