Inspection After Removal

WARNING: This page is about a different car, the 2013 Nissan Armada. However, it is still accessible from the selected car via links, so may be relevant.

Visually check for significant dirt or rust on the water pump body and vane.
Check that the vane shaft turns smoothly by hand and is not excessively loose.
Replace the water pump assembly if the water pump does not perform properly.

Fig 1: Checking Vane Shaft Smooth Operation And Looseness
Courtesy of NISSAN NORTH AMERICA, INC.