Radiator Keeps Pushing Water Out: Why And What To Do?

A lot of car drivers have reported that their radiator is pushing water out. As a result, there have been leaks on the ground. A lot of people do not know what to do with this situation. 

So why does your radiator keep on pushing water out and what do you have to do about it? There are plenty of reasons why your radiator keeps on pushing water out but the very most common reason is a blown head gasket. So if you have a blown head gasket, you should call for repair or replacement. 

However, a blown head gasket is not just the reason why your radiator is pushing water out. There are still many reasons for it and so you have to know the main cause so that you will know the resolution. 

Knowing the cause is the first step towards fixing the problem because you cannot fix a problem if you do not know what it is. They do not even know what they have to do in this scenario. 

So, in this article, we will be talking about why your radiator is pushing water out and what you can do if this happens to you. Let us start. 

Radiator Keeps Pushing Water Out

What Causes Water To Push Out Of The Radiator?

There are quite a few reasons. But the most common is a blown head gasket. So, what will happen is that the high pressure in the combustion chamber will squeeze its way into the break in the head gasket and the coolant passages. 

As a result, the pressure build-up within the cooling system will push coolant into the overflow tank. So you need to check if your oil has been contaminated with coolant.

How To Stop Water From Coming Out Of The Radiator?

Your radiator can be leaking water for a lot of reasons. You need to know first where the leak is. You have to dry the surface of your radiator. 

Dry also your radiator valves and any visible pipes with towels. The leak will then come out from the part that will remain wet. You can also turn off the valves to the radiator if possible. 

Do this by unscrewing it clockwise. You can stop the leaking water, but you can have it repaired by an expert. But you can follow this step by step guide.

1. Drain

You have to drain the system just below the leak. With that, you need to know first where the actual leak is. So do checking first.

2. Turn Off Valve

The next step is that you have to turn off your supply valve. You also have to turn off the lockshield valve. 

3. Catch The Water

You then need to catch any water that is escaping in a bucket. You can also use an old towel.

4. Undo That Union Nut

Undo then the union nut and then use an adjustable spanner. Open the valve so that it can bleed and then release any remaining water in it. Wrap the valve tail in tape.

Should You Visit A Mechanic With This Problem?

It depends. If you know how to fix the problem, you need to visit a mechanic. Many car drivers know what to do, and most of the time, they fix it in their garage or their backyard without going to a mechanic. 

If you know what to do and how to fix things, you can do it yourself. If you’re not sure, then you can visit a mechanic. 


In summary, many car drivers have been experiencing water that is coming out of their radiators. Some car drivers know what to do, and they handle the issue themselves. 

Unfortunately, some car drivers also do not know what to do. You can visit a mechanic if you do not.



Image credits – Canva

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My name is Hank, and I've been in the automotive industry for 27 years. I've been working in my own auto repair shop for the last 13 years, and now I want to help you here, on my blog. Let me know if you have any questions. Read more