Using The Blue Devil Head Gasket Sealer The Right Way

If you’re looking for how to use Blue Devil head gasket sealer directions, it’s easy enough to use with the proper knowledge. While the engine is cold, remove the radiator cap, slowly add the sealer, replace the cap, turn on the engine, and allow it to idle for 50 minutes, then finish by filling it up with an appropriate mixture of water and antifreeze.

BlueDevil Head Gasket Sealer Tips Directions

Find detailed steps in our guide below, including why and how to flush the radiator before installing the Blue Devil. It’s a great resource because you’ll also learn how to monitor your system for leaks.

How To Use BlueDevil to Seal Your Leaky Head Gasket

To use BlueDevil to seal your leaky head gasket, allow the car engine to cool down before removing the radiator cap. Slowly pour the right amount of the sealer into the radiator, replace the cap, and turn on the engine and the heater to Max.

Leave the engine running for 50 minutes. The head gasket plays a critical role in ensuring the proper performance of the engine. You’ll find this essential component between the cylinder head and engine block. It prevents engine leaks, preserves the engine’s power, and helps with compression ratio.

Like any other component in your vehicle, the gasket is a wear-and-tear item. At some point in time, it will fail. When that happens, the engine will experience leaks, which can cause power loss. As a result, the engine will require working harder to keep the car moving.

Also, a faulty gasket can cause coolant loss, impacting the proper performance of the air conditioning system. You can still drive with a defective gasket. However, ignoring this problem will probably lead to more damage and necessitate costly repairs.

Therefore, it’s essential to act fast once you notice a leak in the head gasket to ensure the issue doesn’t get out of control. And that’s where the BlueDevil head gasket sealer comes into play. According to the manufacturer, this formula fixes blown gaskets and prevents leaks permanently.

1. Prepare Your Materials

Follow these steps to learn how to use Blue Devil pour and go head gasket sealer.

First, ensure you have these items handy:

  • A can of Blue Devil gasket sealer
  • Clean water in a container
  • Car jack
  • Gloves
  • An appropriate coolant (antifreeze)
  • A wrench/pliers
  • An empty bucket

Take note that you have to refer to your owner’s manual for the appropriate car coolant. Generally, vehicles made in 1998 and later usually require antifreeze that uses Organic Acid Technology free of silicate (OAT). This type of antifreeze provides better corrosion protection, which boosts the longevity of parts.

2. Allow the Engine To Cool Down

The engine must be cold before touching the radiator. Experts highly discourage handling the radiator while the engine is hot. The coolant can spray out and cause severe burns on your skin.

Allow the Engine To Cool Down

Be patient and allow the engine and the radiator to cool down before removing the cap.

3. Jack up the Car and Prepare To Drain the Coolant

Jack your vehicle’s front wheels up to give you easy access to the radiator. The Blue Devil requires a free-flowing cooling system before adding the sealer. Therefore, a flush will be necessary. Open the hood and locate the radiator.


Place a container directly below its drainage valve. You’ll often find this valve connected to the bottom of the radiator on the right or left-hand side. This valve has a bolt at the end, usually with a plastic top that you can easily remove with a screwdriver.

Do you have to remove thermostat to use Blue Devil? Not necessarily, but head gasket sealers can get your thermostat clogged or jammed up. The Blue Devil contains no particulate matter or solid that can harm your solid (according to the company). However, it’s always better to be safe than sorry.

4. Drain the Coolant

While wearing gloves, twist the bolt on the valve open. You’ll need pliers or a wrench (spanner or a socket and ratchet) to do that. Once the valve is out, the coolant will start draining into the container.
Wait until the flow reduces to a drip before tightening the valve until you begin flushing. Store the old coolant safely and later find out if your local mechanic can recycle it.

5. Open the Radiator Cap

With your gloves on or using a piece of a large cloth, turn the cap anti-clockwise to the first stop. Hold on to allow any pressure remaining in the cooling system to escape. After that, push down on the cap and turn it counterclockwise until it’s out.

6. Do the Flushing and Then Add Water

Use a suitable flush solution (e.g., Blue Devil Radiator Flush) or just water. You’ll find the flushing instructions on the packaging if using a flush solution. To flush with clean water, pour it into the radiator using a hose and then replace the cap.

Depending on your vehicle model and manufacture year, you may not have direct access to the radiator. In that case, you’ll add the water directly into the radiator through the hose and then reconnect it.

After that, you’ll need to start the engine and allow it to run for about 15 minutes. That will help circulate the water across the system for efficient coolant drainage. Next, switch off the engine and allow it to cool down. Repeat the steps above to drain the water off the system.

Once the flushing is complete, top the system up with water. Ensure you leave enough space for the appropriate amount of the Blue Devil head gasket sealer. “How much Blue Devil head gasket sealer should I use?” You should find the recommended amount of sealant on the bottom of the bottle. The amount generally depends on the size of your cooling system.

7. Install the Sealant

Now it’s time to install the Blue Devil. Pour the sealant into the radiator slowly to the fill line. The pouring session should take a full minute. Once you’ve added it, replace the radiator cap and then turn the engine on.

Next, switch the heater to the maximum and the fan on high. Now allow the car to idle with the cap on for about 50 minutes.

Install the Sealant

“Can you put Blue Devil in coolant reservoir?” has crossed many people’s minds. As mentioned, sometimes you lack direct access to the radiator, depending on your car model. The Blue Devil discourages pouring the product into the reservoir/overflow. Use the hose and then reconnect it back.

A head gasket sealer will harm a cooling system if the constituents of its formula contain solids and other particulate matter. Luckily, there are good-quality products like Blue Devil that won’t damage your engine. They are safe, easy to use, and bond perfectly to metal, alloy, and plastic to stop leaks effectively.

8. Turn the Engine off and Allow It To Cool

After 50 minutes of idling, turn off the engine and let it cool down. You should give it up to one hour. After that, go to the next step.

9. Top Up With a Suitable Antifreeze

Once the engine has cooled off, remove the radiator cap and add a suitable mixture of antifreeze and water. When filled, run the engine for about 15 minutes without the radiator cap but with the heater to MAX.

That will help in bleeding any air pockets from the radiator. Finally, switch off the engine and seal the radiator.
You need to ensure that the head gasket sealer works. To do that, pay attention to the common telltale symptoms discussed below.

How To Identify Common Symptoms of a Leaky Head Gasket?

To identify common symptoms of a leaky head gasket, you must consider how your engine performs. Engine misfires, white smoke coming from the exhaust, and engine overheating are almost certain indicators of a leaky gasket. Other signs include being consistently low on coolant.

Identify Common Symptoms of a Leaky Head Gasket

1. Engine Misfire

A head gasket leak can result in the engine misfiring. An engine misfire will most likely cause a feeling of jerking motion, particularly when accelerating the vehicle. The weird experience results from the engine cylinder not firing, so a combustion reaction isn’t happening.

2. White Smoke off the Exhaust

A blown head gasket can also cause coolant to burn, resulting in white smoke from the exhaust. Since coolant consists primarily of water, when it burns in the engine, you’ll see water vapor coming out of the tailpipe as white smoke.

3. Chronically Low Coolant Levels

A chronically low coolant level means you have a coolant leak somewhere. The leak is probably at the gasket if it’s not in the engine. Take note that a leaking radiator cap (due to a defective seal) or a leak between hoses can also trigger this low coolant problem.

4. Engine Overheating

Another notorious sign that you have a blown head gasket is an engine overheating problem. As mentioned, a leaking gasket will reduce the engine’s power. In other words, a leaky head gasket will cause the engine to overwork to create the necessary power. That will lead to overheating.

Overheating Engine of a Car

Furthermore, a problematic gasket will cause the coolant to evaporate. Without enough coolant, your car’s cooling system will underperform and worsen the overheating situation. If this becomes chronic, you’ll always notice the temperature warning light on the dashboard.

5. Rough Idle or Engine Knock

A defective gasket can cause the engine to lose compression. As a result, the engine will run rough at idle, knock, and sometimes stall. Many other problems can cause rough idling or knock, though. A compression leak test will be the best way to determine if you have a gasket leak.

The above BlueDevil head gasket sealer instructions will be helpful if you discover a leak in your cooling system. Can you use Blue Devil head gasket sealer twice? As mentioned, this product contains no solids or particulate matter that can harm your engine. Therefore, you can install the formula repeatedly.


– What Are the Common Causes of Head Gasket Leaks and Blows?

The common causes of head gasket leaks and blows include excessive oil in the engine. The extra engine oil creates excessive pressure in the engine, resulting in leakages as the oil looks for an escape through the gaskets and seals. Engine overheating is another notorious trigger of leaks and blows.


Thanks to our guide above, installing the BlueDevil gasket sealer shouldn’t give you a headache anymore. Here’s a recap:

  • Flushing the radiator is essential to ensure the system is free-flowing before installing the sealer.
  • Take note that you can’t install the Blue Devil in the coolant reservoir.
  • If you don’t have easy access to the radiator, pour the product directly through the hose and reconnect it.
  • You can use the Blue Devil gasket sealer more than once.
  • Common signs of a leaky gasket include engine misfires, constantly low coolant levels, and overheating issues.

You are now informed enough to undertake the task like a pro. So, find the tools and seal that leaking gasket today!

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