What is a common sign of a failing water pump?

A common sign of a failing water pump is engine overheating. The water pump is critical for circulating coolant throughout the engine and the radiator, helping to maintain the engine's operating temperature. If the water pump is failing, it may lose its ability to circulate coolant effectively, leading to insufficient cooling of the engine. This can cause the engine temperature to rise, resulting in overheating.

While strange noises can also indicate issues with a water pump, such as a loose or worn bearing, engine overheating is a more direct and critical indicator as it directly affects the engine's performance and longevity. Low fuel efficiency and increased exhaust output are typically more associated with other engine issues rather than a failing water pump.