When you open the hood and notice bubbles in your power steering reservoir, it can be a little scary. 

But don’t panic! Bubbling is a common problem that happens when air gets into the power steering system. 

A system like this is supposed to be completely filled with fluid, so when air sneaks in, it can cause trouble.

In this article, we’ll walk you through what causes bubbling, how to fix it step-by-step, and how to stop it from happening again. 

This guide is written in a simple way, perfect even if you’re not a car expert!

Why Is My Power Steering Reservoir Bubbling?

Before you grab any tools, it’s important to know why bubbling happens. Bubbles are not normal in a closed hydraulic system like power steering. Here are the most common causes:

• Low Fluid Levels: When the fluid is low, air pockets can form inside the system. As the steering pump circulates the fluid, it pulls in air, creating bubbles.
• Leaky Hoses: Power steering hoses are made of rubber, and over time, they can crack or get loose. Even a small crack can allow air to slip in.
• Damaged Pump Seals: Inside your steering pump are seals that keep air out and fluid in. If these seals wear down, the system can suck in air while it operates.
• Old or Dirty Fluid: Like any fluid in a car, power steering fluid wears out over time. Old fluid can’t protect your system well and can trap air and debris more easily.

If you ignore the bubbles, you could end up with hard steering, weird noises, and even major repairs like replacing the entire power steering pump. That’s why fixing it early is so important.

Step-by-Step Guide to Fix Bubbling in Power Steering Reservoir

Let’s dive into the step-by-step guide to fixing the bubbling issue. You don’t need a fancy mechanic’s shop—just a little time and patience.

1. Check the Fluid Level

The first thing you should do is check the power steering fluid level. It’s simple:

• Open the hood and locate the power steering reservoir. It’s usually a small plastic tank near the front of the engine, often with a steering wheel icon on the cap.
• Remove the cap. Some caps have a built-in dipstick; others have “MIN” and “MAX” lines on the outside.
• Look at the level of the fluid.

If the fluid is low, add more using the exact type recommended by your car’s manual. Some cars need specific fluid types, so don’t guess!

Tip: If the fluid is dirty, dark, or smells burnt, it’s better to flush it out and replace it completely rather than just topping it off.

2. Inspect for Leaks

Bubbling often means there’s a place where air is leaking into the system. Now’s the time to do a careful inspection:

• Use a flashlight and check the hoses connected to the reservoir and steering pump.
• Look for any wet spots, cracks, or loose clamps.
• Don’t forget to inspect around the power steering pump itself for signs of leaking fluid.

If you find a small crack or loose clamp, it’s an easy fix—you can tighten clamps or replace hoses yourself with simple hand tools. However, if you find major leaks or damage to the pump, you might need professional help.

Tip: Even a tiny leak can cause serious bubbling because the system operates under pressure. Fixing even small issues early can save you hundreds of dollars later!

3. Flush and Replace the Power Steering Fluid

If your fluid is old or contaminated, it can trap air bubbles easily. Flushing the fluid is a smart move:

Steps to flush the system:

1. Raise the front wheels off the ground using a jack. Make sure the car is safely secured.
2. Disconnect the return hose (the one that sends fluid back into the reservoir) and point it into a large container to catch old fluid.
3. Start the engine and slowly turn the steering wheel left to right while new fluid is poured into the reservoir.
4. Keep doing this until you see clean new fluid coming out of the hose.
5. Reconnect the hose, refill the reservoir to the proper level, and secure the cap.

Using clean fluid will not only fix bubbling but also extend the life of your steering pump and other parts.

Tip: Always use a fluid that matches your car’s manufacturer recommendations—wrong fluid can cause damage.

4. Bleed the System

After refilling with new fluid, there’s still a chance that air is trapped inside. Bleeding the system helps push that air out.

Here’s the easy way to bleed:

1. With the car still jacked up, turn the steering wheel all the way left and right 20-30 times with the engine OFF. This moves fluid through the system without putting too much pressure on it.
2. Check the fluid level again and add more if needed.
3. Now start the engine and repeat the left-right turning slowly a few more times.
4. Watch the fluid in the reservoir. If you see bubbles disappearing and the fluid looking smooth, you’ve successfully bled the air out!

Tip: Don’t rush! Turning the wheel slowly is important to avoid creating more bubbles.

5. Replace Worn Parts If Needed

If, during your inspection, you found cracked hoses, leaking seals, or a worn-out pump, those parts need to be replaced.

Here’s a simple guide:

Problem	Solution
Cracked or brittle hose	Replace the hose
Loose or rusty clamps	Tighten or replace clamps
Worn pump seals	Replace the steering pump or rebuild it

Replacing a hose is pretty easy for DIYers. However, if the pump itself is failing, it’s a bigger job and might require a mechanic.

Tip: If your steering feels heavy, whines loudly, or still shows bubbling after all your fixes, it could be a deeper pump or rack issue.

Signs That the Problem Isn’t Fixed

After flushing and bleeding, if you still see bubbling, there could be deeper problems like:

• Bad steering rack (especially if fluid leaks onto the ground)
• Worn out power steering pump (causing loss of pressure and weird noises)

If you notice these problems, it’s time to take your car to a trusted shop for a more serious repair. Catching these issues early can still save you from total system failure.

Final Tips to Prevent Future Bubbling

Keeping your power steering healthy isn’t hard! Here’s how:

• Check your fluid regularly — at least once every few months.
• Use the right fluid — cheap or wrong types can cause damage.
• Replace old hoses before they crack.
• Fix leaks immediately — small leaks quickly turn into big, expensive ones.
• Flush your fluid every few years as maintenance.

Taking these steps can prevent bubbling and keep your steering smooth for years to come.

Conclusion

Seeing bubbling in your power steering reservoir can be worrying, but it’s often something you can fix yourself if you act fast. 

By checking your fluid, finding leaks, flushing out the old fluid, bleeding the system, and replacing worn parts, you can fix the problem and avoid costly repairs.

Remember: a little maintenance now can save you a lot of money later! Keep your system healthy, and your steering will stay smooth, easy, and reliable every time you drive.