Toyota 16100-19205 Engine Water Pump Assembly

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A faulty water pump can cause engine damage due to overheating. To check its operation, squeeze the upper radiator hose with the engine running. A working pump will cause a pressure surge. Water pumps have weep holes, which leak coolant if the pump seal fails. Use a flashlight to check for leaks from underneath. If coolant is leaking, replace the pump. A howling sound may indicate failed shaft bearings. Check for shaft wear by rocking the water pump pulley. If there's play, replace the pump. Don't confuse drivebelt slippage, which squeals, with pump bearing failure.

Run the engine and check for leaks.