WARNING: This page is about a different car, the 2004 Infiniti M45. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Main 12 Causes Of Overheating (1 Of 2)
Courtesy of NISSAN MOTOR CO., U.S.A.
Refer to "Causes Of Overheating (2 Of 2)" for footnotes.