Hyundai 25100-21000 Pump Assembly-Coolant

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Run the engine and check for any signs of leaks.

A failure in the water pump can cause serious engine damage due to overheating. There are three ways to check the operation of the water pump while it's installed on the engine. If the pump is defective, it should be replaced with a new or rebuilt unit. With the engine running at normal operating temperature, squeeze the upper radiator hose. If the water pump is working properly, a pressure surge should be felt as the hose is released. The water pump is equipped with a weep or vent hole. If a failure occurs in the pump seal, coolant will leak from the hole. In most cases you'll need a flashlight to find the hole on the water pump from underneath to check for leaks. If coolant is leaking from the weep hole, the water pump must be replaced. If the water pump shaft bearings fail there may be a howling sound at the front of the engine while it's running. Shaft wear can be felt if the water pump pulley is rocked up and down. If there is play in the shaft, replace the water pump. Don't mistake drivebelt slippage, which causes a squealing sound, for water pump bearing failure.