2009 GMC Yukon Owner's Manual - Page 216

Mimic Mode: This mode matches the rear climate control to the front climate control airflow settings. It comes on when REAR is pressed the first time. Independent Mode: This mode directs rear seating airflow according to the settings of the rear controls. It comes on when any rear control is adjusted. Temperature Control: Turn clockwise or counterclockwise to increase or decrease the airflow temperature into the passenger area. Fan Control: Turn clockwise or counterclockwise to increase or decrease the fan speed. Air Delivery Mode Control: Turn clockwise or counterclockwise to change the direction of the airflow. H (Vent): Air is directed through the headliner outlets. ) (Bi-Level): Air is directed through the floor and headliner outlets. The rear system floor outlets are located directly behind the second row seats. The flow can be divided between vent and floor outlets depending upon where the knob is placed between the settings. 6 (Floor): Air is directed to the floor outlets. The rear system floor outlets are located directly behind the second row seats. 3-32