Potentio Temperature Control (PTC)
WARNING: This page is about a different car, the 2005 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.
There are two PTCs (passenger and driver) built into the front air control. They can be set at an interval of 0.5°C (1.0°F) in the 16°C (60°F) to 32°C (90°F) temperature range by rotating the temperature dial. The set temperature is displayed.