Getting Air Out of Cooling System in Your Subaru: A Comprehensive Guide

As a Subaru owner, you know how important it is to keep your vehicle in top condition. One important aspect of this is maintaining the cooling system. Over time, air can get trapped in the system, leading to a loss of efficiency and potentially causing damage to your car’s engine. Fortunately, there are steps you can take to get air out of the cooling system in your Subaru. In this guide, we’ll walk you through the process step-by-step.

Key Takeaways

  • Air in the cooling system can cause problems with your Subaru’s engine, so it’s important to get it out as soon as possible.
  • The process of getting air out of the cooling system involves bleeding the system of air bubbles.
  • You can bleed the cooling system yourself using a few simple tools and following a set of steps.
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Step-by-Step Guide to Getting Air Out of the Cooling System in Your Subaru

Here’s what you’ll need to get started:

  • A socket wrench
  • A flat-head screwdriver
  • A container for the old coolant
  • A funnel
  • A new container of coolant
  • A Subaru-compatible coolant

Now let’s get started with the steps:

Step 1: Turn Off the Engine

Before you begin, make sure the engine is turned off and the car is cool. You don’t want to be working on a hot engine!

Step 2: Locate the Radiator Cap

Locate the radiator cap—it’s usually located on the top of the radiator. If you’re not sure where it is, check your owner’s manual.

Step 3: Remove the Radiator Cap

Use a socket wrench to loosen and remove the radiator cap. Be careful, as the system may still be pressurized and hot coolant could spray out.

Step 4: Fill the Radiator

Using a funnel, pour coolant into the radiator until it is full. Make sure you are using the correct coolant for your Subaru.

Step 5: Fill the Reservoir

Next, locate the coolant reservoir. It should be near the radiator and labeled "coolant." Fill it to the "full" line with the same coolant you used in the radiator.

Step 6: Turn On the Engine

Start the engine and let it run for a few minutes. This will circulate the coolant and help release any trapped air bubbles.

Step 7: Check the Coolant Level

After a few minutes, turn off the engine and let it cool for a bit. Then, check the coolant level in the radiator and the reservoir. If the levels are low, add more coolant until they are full.

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Step 8: Repeat the Process

Repeat the previous steps until no more bubbles are coming out of the system. This may take a few rounds of filling and running the engine.

Step 9: Reinstall the Radiator Cap

Once you’ve removed all the air bubbles, reinstall the radiator cap and make sure it is tight.

Step 10: Take Your Subaru for a Test Drive

Finally, take your Subaru for a test drive to make sure the cooling system is working properly. Keep an eye on the temperature gauge and listen for any unusual sounds.

Frequently Asked Questions

How often should I bleed the cooling system in my Subaru?

It’s a good idea to bleed the cooling system at least once a year or whenever you notice signs of air bubbles in the system.

What are the symptoms of air in the cooling system?

Symptoms of air in the cooling system include overheating, low coolant levels, and bubbles in the coolant.

Can I use any type of coolant in my Subaru?

No, you should only use Subaru-compatible coolant in your Subaru. Make sure to check your owner’s manual for the correct type of coolant to use.

Should I take my Subaru to a mechanic to have the cooling system bled?

While you can bleed the cooling system yourself, it’s always a good idea to consult a mechanic if you’re unsure about the process or if you notice any problems with your vehicle. A mechanic can also check for any leaks or other issues that may be causing air bubbles in the system.


Getting air out of the cooling system in your Subaru may seem like a daunting task, but with a little patience and the right tools, it’s something you can do yourself. Regularly checking and bleeding the cooling system can help prevent major problems down the line and keep your Subaru running smoothly for years to come.

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Billy Covington

With a passion for all things automotive, Billy is our go-to expert on Subaru performance upgrades and modifications. He's been featured in several car magazines and blogs, and his extensive knowledge and expertise make him a valuable member of our team. When he's not working on cars, he enjoys playing guitar and writing music.

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