Water Pump: Inspection

WARNING: This page is about a different car, the 2007 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT WATER PUMP ASSEMBLY
1. Visually check the drain hole and air hole for coolant leakage.
  
  Fig 1: Checking Drain Hole & Air Hole For Coolant Leakage
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Turn the pulley, and check that the water pump bearing moves smoothly and noiselessly.
  If the bearing does not move smoothly and noiselessly, replace the water pump.