Parts: $34 - $68. The average cost for a water pump replacement is between $296 to $400. Labor costs are estimated between $262 to $332 while parts are priced between $34 to $68. Get a personalized estimate based on your location and specific car.Estimate does not include taxes and fees. Common Symptoms. Water pumps require replacement if they begin to leak coolant or become noisy. Leaking water pumps can result in damage to the drive and timing belts. A failed water pump can be caused by problems in the cooling system, such as a failing thermostat, radiator, or head gasket.