Potentio Temperature Control (PTC)
WARNING: This page is about a different car, the 2005 Nissan Quest. 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 from 16°C (60°F) to 32°C (90°F) temperature range by rotating the temperature dial. The set temperature is displayed.
Courtesy of NISSAN MOTOR CO., U.S.A.