How to Properly Burp the Coolant in Your 2.5-liter Subaru for Optimal Performance

Subaru is a popular brand among car enthusiasts who value a combination of reliability, performance, and style. If you’re one of those DIY enthusiasts who own a 2.5-liter engine Subaru, this article is for you. One of the essential tasks you need to know when it comes to maintaining your Subaru is burping the coolant. Burping the coolant helps to remove any trapped air in the system that can cause severe damage if not fixed. In this article, we’ll provide essential information on how to burp the coolant in your 2.5-liter Subaru for optimal performance.

What is Burping the Coolant and Why is it Important?

Burping the coolant is the process of removing air pockets from the engine’s cooling system that traps air and prevents the coolant from circulating efficiently. When your Subaru’s cooling system has trapped air, it reduces the system’s ability to regulate the engine temperature, causing your car to overheat. Overheating causes damage to your engine, resulting in costly repairs. Therefore, burping your coolant regularly is essential to eliminate any trapped air and ensure your coolant system functions optimally.

Tools Required for the Process

To successfully burp your coolant, you’ll need the following tools:

  • A Funnel
  • A Clean Rag
  • A Coolant Reservoir
  • A Coolant Flush
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Step-by-Step Instructions on How to Burp the Coolant in a 2.5-liter Subaru Engine

Before burping your coolant, make sure your Subaru is turned off, and the engine is cold. Follow these step-by-step instructions to ensure you burp your coolant correctly.

  1. Locate the Coolant Reservoir: Look for the coolant reservoir and the radiator cap under the hood of your Subaru. You should find a cap labeled "coolant" or "radiator" on the coolant reservoir.

  2. Add Coolant: Remove the coolant reservoir cap and add coolant till it reaches the "cold fill" line or just below the top of the reservoir.

  3. Start the Engine: Turn on your engine and let it idle for approximately 15-20 minutes. The engine will start to warm up, and coolant will start to flow through the system.

  4. Rev the Engine: Rev the engine to 2500 RPMs for approximately 5 minutes while keeping an eye on the temperature gauge. This process will help to circulate the coolant through the system and remove any trapped air.

  5. Turn off the Engine and Let it Cool: After 5 minutes of revving the engine, turn it off and wait for it to cool down. Ideally, it would be best if you let the engine cool to room temperature before proceeding to the next step.

  6. Check the Coolant Levels: Check the coolant reservoir to see if the coolant levels have changed. If you notice that the levels are low, add more coolant till it reaches the "cold fill" line.

  7. Repeat the Process if Needed: Repeat steps 3-6 until the coolant levels remain constant, and no air bubbles rise to the surface.

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Common Mistakes to Avoid While Performing This Process

Here are some common mistakes you should avoid while burping your coolant:

  • Not letting the engine cool to room temperature before adding coolant.
  • Adding too much coolant above the "cold fill" line.
  • Revving the engine too hard or for too long intervals, which may lead to overheating.

Tips for Maintaining the Coolant System for Optimal Performance

Regular maintenance of your coolant system is essential for optimal performance and longevity of your Subaru. Here are some tips to maintain your coolant system:

  • Check the coolant levels regularly and add as needed.
  • Replace or flush the coolant every 50,000 miles or as recommended by your car manufacturer.
  • Check for leaks in your coolant system and repair them promptly.


Q. How often should I burp my coolant?
A. You should burp your coolant system every time you replace the coolant.

Q. Can I burp my coolant system myself?
A. Yes, you can comfortably burp your coolant system by following this guide.

Q. Can I use any coolant brand in my Subaru?
A. You should use the coolant recommended by your manufacturer in your Subaru to ensure optimal performance.


Burping your coolant is an essential task you need to know as a Subaru owner. Regularly burping your coolant system eliminates trapped air pockets that can cause engine damage, engine failure, and costly repairs. Burping your coolant is an easy task that you can complete yourself using the right tools, procedures, and guidelines. Regular maintenance of your coolant system is also essential for optimal performance and longevity of your Subaru. By following these tips, you can ensure your Subaru’s cooling system functions optimally, keeping your engine running smoothly.

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Alton Brobst

As a longtime Subaru enthusiast, Alton brings a wealth of knowledge and experience to our blog. From his early days of tinkering with engines to his current role as a certified Subaru technician, Alton has seen it all when it comes to Subarus. When he's not working on cars, he enjoys hiking and exploring the great outdoors.

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