2005 GMC Envoy Owner's Manual - Page 165

Envoy or Envoy Denali Envoy XL To operate the rear air conditioning system, the front air conditioning system must be on. With the front air conditioning system off, the rear system controls can only be used to circulate air in the rear of the vehicle. To adjust the airflow speed, turn the fan knob (driver override switch), located on the front center floor console to 1, 2 or 3. The rear mode and temperature positions now mimic the front control system mode and passenger side temperature. 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. 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. To activate the second row seat controls in the following systems, set the fan knob, located on the front console, to R. P (On/Off): Press this button to turn the rear climate controls on or off. The rear control will only turn on if the front is on and not in defrost mode. 3-29