WARNING: This page is about a different car, the 2006 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Intake Door Motor (Driver) - Front Heater And Cooling Components
Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 2: Identifying Intake Door Motor (Passenger) - Front Heater And Cooling Components