Water Pump: Inspection

WARNING: This page is about a different car, the 2006 Lexus IS 350. However, it is still accessible from the selected car via links, so may be relevant.

WATER PUMP ASSEMBLY
1. Visually check the drain hole for coolant leakage.
  If leakage is found, replace the water pump assembly.
  
  Fig 1: Identifying Water Hole And Air Hole Of Water Pump Assembly
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Turn the pulley and check that the water pump bearing moves smoothly and does not make any noise.
  If necessary, replace the water pump assembly.