2. There are two ways to check the performance of the pump installed on the engine. If the check shows a pump malfunction, replace it with a new one or overhaul it.
3. There is a "drain" hole on the underside of the water pump housing. If the seal is faulty, coolant will leak out through this hole. To see it, you need to look at the water pump from below, so lift the car and secure it on jack stands. Use a flashlight to detect a leak from the pump.
4. When the water pump shaft bearings fail, they usually make a whistling sound. Shaft wear that leads to bearing failure can be determined as follows: move it up and down while holding the pulley. If you feel a lot of play, the shaft and/or bearing are worn out and the pump needs to be replaced.
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