Most of the time this doesn't mean the pump is broken. In many cases the motor is still running, but something is preventing water from moving through the system. The cause is usually one of a few simple issues—an airlock in the pump, debris blocking the intake, a kinked tube, or an impeller that can't spin freely.
High-Pitched Squealing
This is one of the earliest signs. A squealing sound usually means the water pump pulley or internal bearings are wearing out. As the bearings fail, the pulley becomes unstable and causes the serpentine belt to slip—creating a sharp squeal when the engine is running.
5 Warning Signs Your Water Pump May Be Failing
Water pumps on newer vehicles can last over 100,000 miles, while older models typically require replacement between 60,000 and 100,000 miles. Signs of water pump failure include coolant leaks (visible as green puddles), elevated engine temperature readings, grinding noises under the hood, and weep hole leakage.
A water pump should last anywhere between 60,000 and 100,000 miles. A water pump replacement costs between $400 and $800 depending on the vehicle and the difficulty involved. Parts can run from $200 to $400, with labor services similarly priced. These estimates do not include taxes or shop materials, and disposal fees.
Diagnosing a failing water pump often involves:
Common Symptoms of a Blown Head Gasket
If you notice rising engine temperatures, visible coolant leaks, unusual whining noises near the front of the engine, or steam coming from the radiator area, the pump may be failing. A damaged pump can also cause inconsistent cabin heating, since the heater core relies on proper coolant flow.
All You Need To Know. A failing water pump can lead to catastrophic engine damage if ignored. As the heart of your vehicle's cooling system, the water pump keeps your engine from overheating by circulating coolant through it.
To solve the issue, you can take the following actions:
Inside the water pump is an impeller, which looks like a small fan and is responsible for pushing coolant through the system. Over time, the blades can wear down or corrode, reducing the pump's ability to move coolant effectively. Since the housing remains intact, there's no leak—but the flow is severely restricted.
Troubleshooting Tip:
Follow the pump's manual to ensure it is properly primed before starting it again. This helps remove any air that may be trapped in the system. Inspect the intake lines and discharge pipes for debris restricting water flow. Cleaning these lines can get your pump working again.
Common Causes: - Low Water Level: If the water level in the well or tank drops below the pump's intake, it may suck in air, triggering rapid cycling. - Faulty Pressure Switch: A malfunctioning switch fails to maintain consistent pressure, causing the pump to restart frequently.
Signs of a Broken Water Pump
A reliable way to determine whether a head gasket is blown is to test for carbon dioxide. In this test, the coolant is examined for traces of combustion gasses.
The most common misdiagnoses of a blown head gasket are disappearing coolant and an engine that seems to be overheating for no apparent reason. To determine the exact cause, try refilling your cooling system to see if this keeps your car cool. If it does so for several days, then you likely only have a coolant leak.
Remove the radiator cap and perform a cold start to test if this is the case. You should be able to see movement of the coolant inside the radiator. If not, it is likely that the internal water pump impeller is missing or only partially remaining.
Below are 3 top causes of water pump failure caused by external issues and techniques for prevention.
Over time, the radiator can become clogged by deposits of dirt and sediment, preventing the coolant from flowing properly. One of the clearest indicators is that the engine is warming up abnormally, reaching high temperatures if you are stopped with the engine running, but cooling down if it is in motion.
The water pump is in the center and they would have to remove the timing belt to replace the pump, which is typical on most cars. It's no more difficult than jobs you've done before, but a lot more time consuming. Prepare to spend at least a full day on it, possibly a weekend.
Water pump replacement costs start around $400 and can go over $1,200, depending on your car and where you live. The pump itself is only $100-$400, but it's the labor that gets expensive.
Aftermarket replacement water pumps are as durable as their OE counterparts but they're more affordable, which means you can get the same quality while saving money. The best aftermarket water pump brands are GMB, Gates, DNJ, DriveMotive, Dayco, and AC Delco.