5 Symptoms of a Bad Water Pump and Replacement Cost Author: Autotechnician Overheated Engine. The most obvious symptom will be an overheated engine. Since a functional Radiator Steam. If there is steam emitting from your motor on its front side while you’re driving or Sounds. If your motor’s front area has a whining or buzzing noise coming out of it, then there could Fluid Leak. There is a weep hole in every water pump so that coolant in its housing area can leak See all full list on cartreatments When to Replace Your Car's Water Pump | Angie's List The water pump receives little attention tucked away out of sight under your car’s timing belt cover. But without a water pump, your car would overheat and you'd be left shopping around for a new engine.