Temperature Control Dial (Temperature And Mode Control) (Rear)
WARNING: This page is about a different car, the 2006 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.
Increases or decreases the set temperature. The mode also changes from foot at full hot setting, to foot/vent mid-range (warm) setting, and then to vent on full cold setting.