2. There are three ways to check the water pump without removing it from the car. If the pump is faulty, it should be replaced.
3. When the engine has reached normal temperature, squeeze the upper radiator hose. If the water pump is working properly, the pressure will begin to drop when you release the upper radiator hose.
8.4 If coolant leaks from the filter hole, the water pump should be replaced.
4. The water pump has vent holes. To check for leaks from these holes, you will need a flashlight and a mirror, as the holes are located at the bottom of the pump (8.4).
8.5 If the shaft is found to be loose, the water pump should be replaced.
5. If the water pump bearings fail, it will start to operate noisily. Excessive free play of the pulley (8.5) indicates wear of the pump shaft.