The water pump circulates coolant between the engine and radiator to keep operating temperatures in spec.
A belt- or chain-driven impeller pushes coolant through the block, head, and radiator. Modern engines may use an electric water pump for efficiency.
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Replacement runs $350–$1100 including parts and 2-7 hours labor. Exact cost depends on vehicle, parts tier (OEM vs aftermarket), and local labor rate.
Expected lifespan is 80,000-120,000 miles (often replaced with timing belt). Driving conditions, climate, and maintenance affect real-world life.
Coolant leak from weep hole; Overheating; Whining or grinding from pump area; Steam from under hood; Low coolant warnings.
Most modern water pumps are sealed units that get replaced rather than rebuilt. A shop will diagnose, confirm with a load or output test, then swap the unit and verify operation.
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