Genuine 1991 Chevrolet Metro Water Pump

1991 Chevrolet Metro Parts Questions & Experts Answers

• Q: What are the ways to check the operation of the water pump while it's installed on 1991 Chevrolet Metro?

  A: The engine can be damaged extensively by a failed water pump that causes overheating. One way of checking the operation of the water pump is to do it while it is still on the engine. However, if it is defective, replace it with a new one or rebuilt unit. Squeeze the upper radiator hose with the engine running at normal operating temperature. When the hose is released, one should feel a pressure surge if the water pump is functioning correctly. Water pumps are constructed with weep or vent holes. If there is a failure in a pump seal, coolant will come out through this hole. You'll probably need a flashlight to locate such a hole on the water pump for leak testing purposes. The failure of water pump shaft seal causes leakage from the water pump weep hole due to which it eventually drips coolant. In case bearings of water pump shafts fail while an engine is running you may hear some humming sound from drivebelt end. Rocking upward and downward of the pulley for the water pump means that there is wear in the shaft. A squealing sound resulting from drivebelt slippage does not mean that there are worn-out water pump bearings.