WARNING: This page is about a different car, the 2011 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.
Check if the reservoir tank engine coolant level is within the "MIN" to "MAX" when the engine is cool.
Fig 1: Checking Reservoir Tank Engine Coolant Level
Courtesy of NISSAN MOTOR CO., U.S.A.
Adjust the engine coolant level if necessary.
WARNING:
Never remove reservoir tank cap when engine is hot.