GM 89018165 Engine Coolant Pump Kit

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A faulty water pump can cause engine damage due to overheating. A coolant leak indicates a shaft seal failure in the pump, often visible near the pump. Checking for leaks in the pump's weep holes is possible with a flashlight and mirror. If the pump's shaft bearings fail, a howling sound may be heard, and shaft wear can be felt by moving the pump pulley. Don't confuse drivebelt slippage, which causes a squealing sound, with pump bearing failure. To check pump performance, turn on the heater; a failing pump may not circulate hot water efficiently.

To remove the water pump from the engine, you should carefully remove it, tapping it gently if it's stuck.

To remove a V8 engine, follow the same steps as for a V6 engine, but also remove the battery and battery tray for access.

It is possible to check these holes for leaks using a flashlight and a mirror. In most cases, the leak can be detected from coolant streams or drips near the bottom of the water pump housing.