Toyota 16100-59275 Engine Water Pump Assembly

Water pump failure can cause engine overheating and damage. All pumps have a weep hole and a vent hole; if coolant leaks from these, replace the pump. On V6 models, use a flashlight to locate the holes behind the pulley below the pump shaft. On V8 models, the pump is behind the timing belt cover and leaks will emerge from the bottom cover. If the pump shaft bearings fail, a howling sound may be heard from the engine, and bearing wear can be detected by rocking the pump pulley.