GMC 2007 Envoy - Manual (Page 196)

6 (Floor): When floor mode is selected, the rear
system will distribute air from the second seat
side floor outlets and the third seat floor outlet.
If your vehicle has the rear seat audio system, the
lower buttons are used to adjust the rear seat
climate control system. The temperature of the air
coming through the rear outlets is determined
by the front passenger’s temperature setting.
P (On/Off): Press this button to turn the rear
climate controls on or off.
z9 y
(Fan): Press this button to adjust the
fan speed.
z\ y (Mode): Press this button to change the
direction of airflow (panel, bi-level or floor) to
the rear seat area.
The rear control will only turn on if the front is on
and not in defrost mode.
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