How to Replace a Water Pump?

A water pump is a tool that helps to pump out the water from the ground, garden, pool, car, and others. The best part about the water pump is that it falls within the budget. Various water pumps in the market are used for varying purposes. If you already have a very old water pump, then you might have to replace it. 

To know how to replace the water pump and why the water pump fails in the first place keep reading the section. The below section will explain to you entirely about water pumps starting from the symptoms of a bad water pump to the dos and don’ts that you should follow while replacing the water pump. So, keep reading to know all, about it before replacing the water pump.

Symptoms of bad water pump

It is very common for the overheated engine to quickly leading to engine failure. But before that, you should know the signs or the symptoms of a broken or a failing water pump. Below are certain common symptoms that you might find in your water pump which is a sign that your water pump has failed.

  • The elevated temperature of the coolant

This is the most common symptom of a bad water pump. If you see an elevated temperature through the warning light, this is a sign that your water pump is not in good condition. A bad pump would allow the engine heat to be elevated at unsafe levels.

  • Radiator steam

If you see steam billowing right from the front of your vehicle, this is an indication that you should stop and that your water pump is not in the right state. The steam indicates overheating and that the coolant did not circulate through the radiator for cooling down and hence the evaporation occurs.

  • Unusual sound

Another indication that your water pump is not working well is if you hear unusual sounds from your vehicle. Apart from the steam and the elevated temperature if you hear unusual sounds it is directly the cause of the bad water pump.

  • Fluid leak

Apart from the above factors of a fluid leak might also be one of the symptoms of the bad or the failing water pump. If you discover orange or green color fluid beneath the front portion of your car, know that this might be the result of pump wear out.

These are some of the most common symptoms that might occur. The next will tell you the reasons behind the water pump failure.

The reasons why water pump fails

As you already know the signs and symptoms of a bad water pump, you can now move your attention towards the causes of the water pump failing or why exactly does the water pump fails. A few of the causes of a bad water pump have been mentioned below. Please take a look.

  • The first and foremost reason why the water pump fails is the premature corrosion inside the coolant or the cooling system. But in the majority of the cases, the water pump fails primarily because of the shaft leaks.
  • The bent pulley might also cause similar damage. Whenever there is excessive tension over the fan belt it leads to overloading which results in the water pump failing. 
  • There is yet another reason why your water pump might fail that is the cavitations in your coolant system. The movement in the coolant system of impeller blades might create a flow that generates the cavitations which ultimately leads to leakage and overheating and hence you will have to replace the water pump.
  • The pump failure might also be because of worn bearings and might have to replace the existing water pump to function better.

There are many other reasons as well for your water pump failure but these were some of the most common ones. Let us now move on to understand how to replace a water pump.

The process of replacing a water pump

The entire process of removing the old water pump and replacing it with the newer one is a bit technical. But we have here put up few simple and easy steps for you to get an idea of the entire process.

Before putting in place the new water pump, you will have to remove the old one. The steps to remove the old water pump are as follows:

  • The first step is to remove your belt from the AC compressor. 
  • Now you can remove your alternator belts. 
  • Once you are done with this, you could now remove the bolts from your water pump & then push it down to remove it.

We can now move to the process of replacing it with the new one. Once you have already removed a water pump, the replacement of a new water pump in that position is the same. 

  •  All you have to do is to replace the pump with the new one and then tighten up all the 6 bolts. 
  • Once this is done you can go back to the same process how you removed the older water pump. 
  • You can then replace the belts and remove the AC compressor pulley before bolting down the compressor. Drop yet another Bolt and get everything back together bolted.

These were the simple steps that you could follow to replace your water pump. As you have understood the whole process of replacing the old water pump with a new water pump, we can now move on to the next section to understand which the things that should be avoided are and which ones to be followed. 

Do’s and don’ts for water pump replacement

Replacing the water pump requires technical expertise to some extent. So, it is important that whenever you plan to replace your water pump by yourself you also know about the dos and don’ts for the water pump replacement. If you are planning to replace your existing water pump the read the following section carefully. There are some do’s and don’ts that would help you to avoid some common mistakes.


Things that you should follow while replacing the water pump are as follows:

  • It is suggested to flush out the cooling system as most people forget to flush the cooling system and hence unconsciously make a huge mistake that cost them a lot. 
  • The impurities might settle down and they may cause premature water pump failure if they are not flushed out. Use the old pump if you want to avoid the impurities contaminating your new pump.
  • Another point under the dos is to rotate your pump manually. And also make sure that while you rotate it, the water pump rotates freely. As the coolant or the cooling system gets sucked in the mechanical component because of the rotating movement which effectively creates a film that keeps the coolant from spilling. 
  • The next point in concern is properly vented out the coolant. Whenever you are replacing the water pump, it is good if you burp the coolant for getting rid of the air which is trapped. So, always remember to properly vent out the cooling system.
  • Yet another best practice for maintaining a good condition of the water pump is that you keep changing the coolant after every 5 years. This is very important if you want the overall process to go well. So, change it frequently so to avoid any issues. 


Things that you should not follow while replacing the water pump are as follows:

  • Whenever an individual replaces the water pump, there is always a visual difference that they discover. This might look a bit different but there is nothing to worry about.
  • Always do make sure that the new water pump that you will be replaced should be of the same height and must have similar functions as the earlier.
  • Another point that you should always remember is never to use the coolant which is either too cold or too old. In both the situation it is not acceptable. 
  • People do usually collect coolant from their old pump itself to reuse but it is strongly non-advisable as the coolant have their expiry date and they deteriorate with time.

There are many other do’s and don’ts as well that you should take care of while replacing the water pump. Also do not worry much about the seepage from the weep hole. And try not to apply the sealant to dry seal or O-ring seal.

Well, we hope we were able to solve all your queries and that you got all your answers to your unanswered questions. But always do remember to follow the instructions properly while replacing the water pump. It is a process that requires a bit of technical expertise. So, either ask a technical person or an expert to replace the water pump for you or if you do it by yourself do not forget to follow the dos and don’ts properly. 

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