2004 GMC Envoy Owner's Manual - Page 152

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 floor console to 1, 2 or 3. The rear mode and temperature positions now mimic the front control system mode and passenger side temperature. )(Bi-level): 6 (Floor): When bi-level mode is selected in the front controller, the rear system will distribute air from the four headliner outlets and the third seat floor outlet. When floor mode is selected in the front controller, the rear system will distribute air from the third seat floor outlet. -(Defog): When defog mode is selected in the front controller, the rear system will distribute air from the third seat floor outlet. 0(Defrost): When defrost mode is selected in the front controller, the rear system will distribute air from the third seat floor outlet. To activate the second row seat controls in the following systems, set the fan knob, located on the front console, to R. Envoy XL H(Panel): When panel mode is selected in the front controller, the rear system will distribute air from the four headliner outlets. 3-32