For your engine to run at a standard, designated temperature, it must have a constant coolant flow to the engine block. The water pump is the main component designed along with other cooling systems to ensure a consistent flow of coolant to the engine block.
If the water pump work as it’s designated to, your engine will have an average temperature, run smoothly, and travel as far as you want it to.
When the water pump begins to wear out or fails, it will cause catastrophic damages to other parts of the engine system.
Therefore, knowing the symptoms of a bad water pump is one of the keys to preventing a complete engine breakdown resulting from a bad water pump.
This article is a power-packed explanation of bad water pump symptoms and how a water pump works. You will also learn how to tell if the water pump is pumping.
How Does a Water Pump Work in a Car?
As was mentioned, the water pump forces coolant through the cooling system. The water pump contains an impeller—a circular component with fan-like blades—that rotates on a shaft and bearings.
Most water pumps are driven by the engine’s drive belt, timing belt, or timing chain. When the engine is running, the belt or chain turns the water pump’s pulley, causing the impeller to spin.
The impeller draws coolant from the radiator, then pumps that coolant through the engine and heater core.
Although belt-driven water pumps are still common, a growing number of late-model cars now have electric water pumps.
Electric pumps are more efficient since they put zero drag on the engine. Because the design doesn’t require a running internal combustion engine, it also works well in hybrid and electric vehicles.
It’s also worth noting that some modern cars have multiple water pumps. Some systems use two or more electric pumps, while others use a combination of mechanical and electric pumps.
Water Pump Location
There are water pumps found near the drive belt or serpentine belt. This positioning puts the water pump toward the front of the engine.
However, if it’s driven by the timing belt, it can be more difficult to find the water pump. You may need to remove some other parts or covers to get to it.
The only way to know for sure is to reference a service manual or search for a diagram online. Knowing the location of the water pump can help you decide whether you want to replace it yourself or take it to a mechanic.
Common Causes of Water Pump Failure
There are several reasons why a water pump may stop pumping water. These include:
- Clogged intake screens or pipes, which restrict water flow into the pump.
- inadequate power supply, which can prevent the pump from operating correctly.
- Overheating, often due to a lack of proper cooling or excessive load on the pump.
- Worn-out or damaged impellers, which can significantly reduce the pump’s efficiency.
- Faulty pressure switches, which can fail to turn the pump on or off as needed.
Symptoms of a bad water pump
#1. Coolant leak at the front of your car.
The water pump is manufactured to function with gaskets and seals to ensure a steady and adequate flow of coolant travels from the radiator to the engine block.
So, if these seals and gaskets shrink, crack, wear out, or break entirely, there will be a coolant leak from underneath the water pump.
If you notice a leak of coolant that is red, orange, green, or pink in color, ensure you where the leak comes from or contact a professional mechanic to do a thorough diagnosis.
Most often than not, it is a dripping coolant that you should replace before it causes severe engine problems?
#2. Loosen or Noisy water pump pulley.
if you start noticing a high-pitched sound in front of your car from time to time, you might have a loosen belt that generates a harmonic whining or buzzing sound as it turns.
The loose belt can result from a loosened water pump pulley or a worn-out bearing that operates the water pump. When the bearing inside the pump starts wearing out or goes bad entirely, it has to be replaced.
If you notice a buzzing or whining sound in front of your car while idling or driving, ensure you inspect your water pump or contact a professional mechanic for a proper diagnosis.
#3. Overheating Engine.
If the water pump goes bad entirely, it will lose the power to transport coolant through the engine block and the head cylinder.
This can cause overheating, and if not given timely attention, it will cause catastrophic engine damage like engine knocking, burnt pistons, burnt head gasket, or cracked cylinder head.
If you find that the temperature gauge on the dashboard is rising, it’s surely that something is wrong with your cooling system, which is likely to be antifreeze leaking or a faulty water pump.
You want to inspect your cooling system or contact a professional mechanic for thorough checks.
#4. Deposit builds, Rust, and corrosion of the water pump.
Over time, there will be a buildup of different minerals in the water pump due to gradual leaks. Inspect the water pump surface, you may notice rust a non-compatible coolant mixture, contaminated coolant, or radiator cap leak.
Pouring the wrong coolant in your car will the normal process of the engine coolant. In addition to these symptoms, there may be small holes due to cavitation or corrosion.
If you notice these symptoms, you should follow the steps below and replace your water pump or contact a professional mechanic for proper diagnosis and fixes.
#5. Steam coming from the front of your engine.
Finally, if steam is coming from the front of your car while idling or driving, it tells your engine is very high in temperature which can also translate to an engine overheating.
As explained above, it must reach its normal operating temperature quickly and maintain this constant flow for an engine to run efficiently.
If you notice steam under your hood while driving, you should stop your car at a safe place and inspect where the steam is coming from or contact a professional mechanic. It is a bad idea to drive an Overheating engine.
Diagnosing the Problem
Diagnosing the issue with your water pump is the first step towards fixing it. This process involves a combination of visual inspections, performance tests, and in some cases, the use of specialized equipment to identify the root cause of the problem.
#1. Visual Inspection and Performance Tests.
Begin by conducting a thorough visual inspection of the pump and its associated components. Look for signs of physical damage, corrosion, or wear on the impeller, shaft, and bearings.
Check the intake screen for blockages and ensure that the pump is properly connected to the power supply. Next, perform basic performance tests, such as checking the voltage at the pump’s terminals and verifying that the pump turns on and off correctly.
#2. Advanced Diagnostic Techniques.
For more complex issues, advanced diagnostic techniques may be required. This could involve using a multimeter to check for voltage drops or shorts in the electrical circuit, or employing a pressure gauge to measure the pressure at different points in the system.
In some cases, it may be necessary to consult the pump’s manual or contact a professional for guidance.
How to fix water pump leak?
Now that you know why it’s important to troubleshoot your water pump, here are some simple steps on how to do it:
#1. Check the Pressure Settings.
The first step is to check the pressure settings of your pump. The pressure switch needs to be set at a certain level for optimal functioning. If it’s below that level, adjust it accordingly and test the system again.
#2. Check the Fuses.
If there’s no voltage going into your water pump, you should check the fuses. It’s possible that the fuse has blown and needs to be replaced. Also, make sure that all the wires are properly connected.
#3. Look for Leaks.
It’s important to look for leaks when troubleshooting your water pump. This can be difficult and time-consuming, so it’s best to start with the most common places such as pipes, fittings, and valves. If you find any leaks, you should repair them immediately.
#4. Check the Impeller.
The impeller is a crucial part of your water pump and it needs to be checked regularly. If it’s not working properly, the output pressure won’t be high enough and this can affect the performance of your pump. To check for blockages, you can remove the impeller and inspect it.
#5. Inspect the Hoses.
If your pump is not functioning properly, it’s likely that there’s a problem with the hoses. Make sure to check for loose connections or clogs, as this could be causing pressure issues. If there are any damaged hoses, it’s best to replace them immediately.
#6. Check the Bearings.
The bearings are another important part of your water pump and should be inspected regularly. Make sure that the bearings are in good condition and properly lubricated to ensure they don’t cause any problems with the system.
#7. Inspect the Valves.
The valves are responsible for directing the water flow, so make sure they’re functioning properly. Check for debris or dirt buildup and clean them out if necessary. It’s also important to ensure that they’re open all the way for optimal performance.
#8. Test the Pump.
After checking everything else, you should test the pump. Fill a container with water and check the output pressure. If everything looks good, turn on the power and watch for any leaks or other issues.
#9. Check the Motor.
The motor is another key component of your water pump and needs to be checked regularly. Make sure that it’s properly connected to the power source and that all of the connections are secure. Also, inspect the motor for any damage or wear.
#10. Replace Any Damaged Parts.
If you find any damaged parts during your inspection, it’s important to replace them immediately. This also applies to worn-out seals and gaskets, as they could be causing problems with the system.
#11. Clean the Filters.
It’s essential to keep your water pump clean and free of debris. Check and clean any filters regularly to ensure optimal performance. This will also help reduce the amount of maintenance required in the future.
#12. Contact a Professional.
If you’re still having troubleshooting problems with your water pump, it’s best to contact a professional. A plumbing expert can help you diagnose and repair any issues that arise.
When it comes to troubleshooting your water pump, it’s important to take the necessary steps to ensure optimal performance. With these tips, you should be able to quickly troubleshoot any issues you may be having.
How Do You Test The Water Pump?
If you see the temperature gauge climbing or you hear strange noises coming from the water pump area, you should pull over and try to figure out what’s going on. Some of the diagnosis isn’t difficult to do at home with some simple tools.
Here are some things to consider.
- Park on level ground.
- Turn the engine off. It’s best to work with the cooling system when the engine is cooled off.
- Inspect the water pump pulley. Gently wiggle the pump pulley back and forth. You shouldn’t see any movement. If there is any movement, you may need to replace the pump.
- Inspect the system for leaks. If you can find where the coolant is leaking from, you will have a better idea if the water pump is to blame. Look for the leak coming out of the water pump housing or around the gasket. If it’s leaking, replace the pump.
- Inspect the coolant reservoir. If there’s a leak, the coolant level will be lower. Leaks can also occur at the water pump gasket because of contaminated fluid, such as when you don’t perform a coolant flush.
In some cases, you won’t be able to inspect the water pump without removing the timing cover. This can be a complicated procedure that most home mechanics aren’t equipped for.
As professional technicians, it’s always our advice to reach out to a local repair shop if something feels too hard for you to accomplish. You would rather pay a little extra for the repair than have something else break.
FAQs.
Q: What does a bad water pump sound like?
What does a bad water pump sound like? Often, the problems that happen with the water pump result from worn-out bearing inside the water pump pulley and not the pulley itself.
When the bearing starts going bad, it causes a grinding, whining, or buzzing sound in front of your car.
Q: When should I replace the water pump?
Water pumps should last the life of a timing belt. The water pump can last up to 70,000 – 90,0000 miles. If your water pump has covered 70,000 – 90,000 miles, it is ideal for replacing it when doing extensive work that requires taking off the timing belt.
Q: Should you replace the thermostat when replacing the water pump?
The thermostat may have encountered a lot of issues due to the bad water pump. So, the thermostat should be replaced when replacing the water pump, especially if the thermostat has not been replaced for a very long time.
Q: Can a leaking water pump cause rough idle?
Can a bad water pump cause rough idle? Yes. Due to the effects of a bad or damaged water pump like engine Overheating and leaking coolant, your engine will experience rough idle.
Q: How expensive is it to replace the water pump?
The cost of replacing a water pump depends on your car make, model, year, and how difficult it will take to replace your water pump.
On average, you can spend around $250 to $700. The water pump’s actual cost should be $50 – $100 while the service fee should be around $200 – $600.
Q: How do I know if my water pump is working?
Your water pump might be working fine if you do not notice any of the following signs of a bad water pump;
- Coolant leak at the front of your car.
- Steaming coming under your hood.
- Engine Overheating.
- Loosen or Noisy water pump pulley.
Final Thought
You must have known water pump failure causes, symptoms of a bad water pump, and how to replace a bad or failing water pump.
These symptoms will not appear immediately after your water pump starts going bad, so you have to ensure you fix or contact a professional mechanic once you notice any of the symptoms above.