Coolant leak under the vehicle
Engine overheating
Whining, grinding, or squealing noise from the water pump area
Steam coming from the engine bay
Visible corrosion or rust on the water pump
Wobble or play in the water pump pulley
Coolant dripping from the pump’s weep hole
Low coolant level with no obvious external leak
Temperature gauge fluctuating or running hot
Heater blowing cold air when the engine is warm
Serpentine belt slipping or damaged near the pump
Engine warning light on with cooling system-related codes