Pontiac Montana SV6 2007 Owner's Manual page 208

A
(Fan): Slide the lever to 1, 2, or 3 to increase
or decrease airflow to the rear seating area.
Slide the fan knob to 0 to turn the fan off.
AUX: Slide the lever to AUX to allow the rear
passengers to adjust the temperature and airflow
to the rear seating area.
Your vehicle may also have a rear climate control
system that allows the rear passengers to adjust
the temperature and fan speed for the rear
seating area.
When the front climate control is in AUX and the
rear climate control fan or temperature button
is pressed, the display will show the same airflow
modes as the front climate control system. See
Dual Climate Control System on page 204
208
The front control must be in AUX position to enable
adjustment of the temperature and fan speed on the
rear control system. If it is not in AUX, pressing the
fan or temperature button on the rear climate
control will show a DISABLED message on the
rear seat entertainment system display.
t r
(Decrease Setting): Press this button to
decrease the fan or temperature setting when
arrows are active in the display.