Why Does the Oil Cooler Line Leaking At Radiator? Causes And Solutions

Most vehicle owners need to realize how essential to keep engine oil cool. Due to using your car regularly, it’s subjected to stress, so its components lead to wear and tear. With every element, the oil cooler line also will damage. If it fails, it can’t control the oil temperature. Also, it can break down your car’s performance in a negative way. But you may wonder about the oil cooler line leaking at the radiator.

Actually, the line of oil cooler connects your oil filter with a radiator. Basically, it can face many external problems like leaking, corrosion, and dents. Let’s discuss the causes, symptoms, and solution of the oil cooler line leaking at the radiator.

why does Oil Cooler Line Leaking At Radiator

Oil Cooler Line Leaking At Radiator Symptoms:

The oil cooler line will leak or damage over the years. If your car gives warning signs, you should notice them. It’s because it can save you from a lot of problems. Here are some oil cooler line leak symptoms you should see before significant damage occurs.

Low Oil Level

Having less than average oil in your car can be very dangerous. If your oil cooler leaks because of lines under pressure, they will release some oil from the vehicle. And for this, the oil level becomes low.

So you should replace the oil cooler lines after noticing a low oil level instead of stressing the engine’s internal parts due to a leak. Replacing these signs after seeing leaks will prevent big problems and costly repairs.

Oil Leaks Under The Car

Oil puddles under the car are another sign, so don’t ignore them. After noticing it, you should check the oil level. And when you see oil pooling under the car, you should replace the oil cooler lines.

Subsequently, oil cooler line damage is widespread and can affect vehicle performance if not repaired promptly. Oil cooler lines can damage for many reasons, like road debris, age, old oil, or clogging over time. Inspect your oil leak if you are unsure what fluid is leaking under the car.

Check Also: Car Leaking Oil After Oil Change

Crimps or Bends In The Hose

The oil cooler line is made up of hard metal lines and a flexible rubber hose section. Over time, they will show signs of wear due to vibration and road wear and vibration. When you see the line’s metal parts are bent, you should replace them. A clogged oil cooler line can slow the oil flow. And also, it can make it hard to circulate through the cooler.

Causes Of Oil Cooler Line Leaking At Radiator:

You can notice some reasons if the oil cooler line leaks at the radiator. Let’s discuss some causes below:

A Failed Oil Cooler

Oil coolers aren’t typical in gasoline engines, but turbocharged engines usually have them. Usually, oil coolers leak means there is oil in the coolant. Many people say the head gasket is blown, so a blown head gasket affects your engine’s performance.

Fortunately, repairing a leaking oil cooler is not expensive. With this oil cooler, you should replace your gasket. And it also needs to replace and refill the cooling system.

A Blown Head Gasket

Due to the head gasket failure, the oil will leak into cooling passages and end up in the coolant. As a result, you can see brown sludge in the coolant reservoir and radiator. After that, this coolant will leak into the combustion chamber. Thus, this will produce a white cloud of sweet smell. With a compression test, you can verify this blown head gasket.

Damaged Metal Lines

Adequately, if your engine is not getting enough oil, it can run hotter than usual. Oil cooler lines that are bent or out of shape can cause problems.

The metal lines cover the edges of both central rubber hose sections. One edge screws into the oil cooler when another goes into the engine. Both lines fit snugly into their inserts, ensuring a tight seal and preventing oil leakage.

Oil Cooler Line Leak Fix

First, you should discover where oil leaks from the oil cooler line. Most of the time finding an Oil leak from the engine block remote oil cooler adapter bolt is very typical. You can remove two bolts and install an oil drain plug washer with RTV silicone. In this way, you can make sure it doesn’t leak.

You can find oil line leaks where rubber lines meet the aluminum lines. Though you can quickly fix it, you need a drumlin tool to fit the old compressor clump. Cut off the old ring, use this ring that you cut off, and replace it with a new compression clamp.

Mainly, it’s the best way to fix oil leaks. With a new adapter, replacing the entire line is very expensive. Don’t use any motor oil to stop the oil cooler leak. It’s because it can damage the oil pressure relief valve. This way, you can fix your oil cooler line leaking at the radiator.

Oil Cooler Line Replacement Cost:

If you follow your manufacturer’s maintenance schedule, you can increase your oil cooler line life. You should spend $200 to $300 to replace your oil cooler line. Depending on the make and model of the car, the replacement cost may vary.

For example, the Oil cooler line is leaking at the radiator Chevy Silverado replacement cost is $169. Likewise, depending on your place, prices may vary.

Transmission Cooler Line Leaking At Radiator

Your transmission fluid leaking means your transmission cooler lines and radiator have a problem. Leaks or faulty seals between the cooling line and the radiator can cause fluid to vent on your tank.

However, sometimes it’s a radiator problem, and a seep fluid will enter your radiator tank. It can damage your engine, so you should have it done by a professional as soon as possible. A cracked radiator tank or faulty coolant line can be expensive to repair.

FAQ (Frequently Asked Questions):

Q. When should I replace my oil cooler lines?

Accordingly, you should replace the oil cooler line at least once before the 100,000-mile mark. Moreover, you can check your owner’s manual to know the recommended time of the new line. Sometimes, you can hire professionals to replace old oil cooler lines because these difficult jobs need particular tools.

A small leak can be left if you don’t monitor your engine regularly. Yet, this is not ideal because you will see stains on the ground due to a leaking oil cooler line. In addition, if this line leaks badly, you should replace it immediately. While there is no fixed interval for oil cooler line replacement, it may be necessary after 100,000km.

Q. Can oil leak into the radiator from the oil coolers?

It depends on the model, but it can be on some cars. Nevertheless, when a leak occurs, every time you won’t see coolant signs in the oil before seeing oil in the coolant. The reason is that the coolant is under pressure, which helps push the oil into the cooling system.

As a sign, you will see the oil is brownish or gray. If you notice that, you should repair it immediately to prevent severe damage to your engine.

You Can Read:

Q. What causes an oil cooler to leak?

There are many causes of oil cooler leaks. The causes are:

  • Corrosion
  • Physical damage
  • Clogged or Blocked Passages
  • Poor maintenance
  • Oil leaks

Most of the time, an oil cooler can leak because of a combination of these factors. That’s why when you notice the problem too should replace them immediately.

Final Word:

Finally, if you are searching for a solution to an oil cooler line leaking at the radiator, this is the place. It’s because from here you will get the best solution to this problem. Nonetheless, the oil cooler is essential for every vehicle engine cooling system.

If it’s damaged, it can cause many signs affecting the longevity and performance of your engine. Overall, if you see any symptoms and reasons, immediately inspect them by a professional. Generally, if you address any problem properly, you can ensure your car engine’s long life. As a result, you don’t need any costly repairs in the future.

You Can Read Also:

What Can I Do If I Accidentally Put Coolant in Engine oil?

What Causes Coolant Reservoir To Boil? Causes & Solution

How Much Coolant Loss Is Normal? Causes And Solutions


I am Engr. Z Eusuf Lubricant Specialist, Mechanical Engineer & has been working with engine lubricants for a long time and knows what makes them work best. I can help you find the right oil for your needs, and I have tips on how to keep your engine running at its best.

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