Inspection After Removal

WARNING: This page is about a different car, the 2012 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.

Visually check that there is no significant dirt or rusting on the water pump body and vane.
Check that there is no looseness in the vane shaft, and that it turns smoothly when rotated by hand.
If the water pump does not perform properly, replace the water pump assembly.

Fig 1: Checking Vane Shaft And Turns Smoothly
Courtesy of NISSAN NORTH AMERICA, INC.