What are the symptoms of a faulty car engine water pump?

[VonSabrina]

When a car engine water pump fails, it can cause issues in the cooling system, leading to symptoms such as insufficient hot air from the heater, unstable engine coolant temperature, or reduced coolant levels resulting in poor engine circulation and overheating. A faulty water pump often produces a scraping or rubbing noise that varies with engine RPM - the more severe the failure, the more pronounced this noise becomes. The working principle of an automotive water pump: The engine drives the pump's bearing and impeller via the pulley. Coolant inside the pump is rotated by the impeller, flung outward by centrifugal force to the pump housing edges, creating pressure before exiting through outlet passages or hoses.