Toyota G9020-47031 Motor Assembly

A failure in the water pump can have serious consequences for the engine, leading to overheating. To check the functionality of the water pump, start the engine and let it warm up to normal operating temperature, then squeeze the right-side radiator hose. If the water pump is working properly, a pressure surge should be felt as the hose is released. Water pumps are designed with weep or vent holes, and if the pump seal fails, coolant will leak from this hole. To locate the hole, a flashlight may be needed to look through the space behind the pulley just below the water pump shaft. Additionally, if the water pump shaft bearings fail, a howling sound may be heard at the front of the engine while it is running. Checking for bearing wear can be done by rocking the water pump pulley up and down, feeling for any play. It's important not to mistake drive belt slippage, which causes a squealing sound, for water pump failure. Applying automotive drive belt dressing on the belt can help eliminate the belt as a possible cause of the noise.