Wednesday, November 29, 2023

Ultimate Guide to Picking Perfect Forester Power Steering Pump

When it comes to maintaining your Subaru Forester, one crucial component that often gets overlooked is the power steering pump. As a vital part of the vehicle’s steering system, the Forester Power Steering Pump plays a significant role in providing smooth and effortless control while driving. However, choosing the right power steering pump for your Forester can be a daunting task, with various options available in the market. In this comprehensive guide, we will discuss everything you need to know about the Power Steering Pump and how to choose the best one for your vehicle.

Understanding the Functionality of the Subaru Impreza Power Steering Pump

The Subaru Impreza Power Steering Pump is a crucial component of the vehicle’s steering system, working behind the scenes to provide you with smooth and effortless control while driving. This powerful pump is responsible for assisting the driver in turning the wheels by applying hydraulic pressure to the steering mechanism. By doing so, it reduces the effort required to maneuver the vehicle, especially at low speeds or when parking.

The functionality of the Impreza Power Steering Pump begins with the power steering fluid, which is stored in a reservoir and circulated through a series of hoses and valves. When you turn the steering wheel, a control valve in the pump detects the movement and directs the fluid to either side of the hydraulic cylinder, depending on the direction you want to turn. As the fluid pushes against the cylinder, it assists in turning the wheels, making the steering feel lighter and more responsive.

The pump itself is driven by a belt connected to the engine, ensuring that it receives a continuous flow of power. It operates using a series of intricate internal components, such as an impeller and a rotor, which work together to create the necessary hydraulic pressure.

How Does the Subaru WRX STI Power Steering Pump Work?

The Subaru WRX STI Power Steering Pump operates on the same principles as the Impreza Power Steering Pump, but with a few key differences to accommodate the unique needs of the WRX STI. 

Like the Impreza, the WRX Power Steering Pump uses hydraulic pressure to assist in turning the wheels and make steering easier. It also relies on power steering fluid, stored in a reservoir, to create this pressure. However, the STI Power Steering Pump is designed to handle the higher demands of this high-performance vehicle. 

The WRX STI Power Steering Pump features a larger pump housing and stronger internal components to withstand the increased pressure and strain. This allows for more precise control and improved handling, especially during aggressive driving maneuvers. 

Additionally, the WRX STI Power Steering Pump is often equipped with enhanced cooling features, such as larger cooling fins or an auxiliary cooler, to prevent overheating under extreme conditions. This ensures that the pump remains reliable and efficient, even during intense driving sessions or in hot climates. 

Features to Consider When Choosing a Subaru Forester Power Steering Pump

When choosing a Subaru Forester Power Steering Pump, there are several key features to consider that will ensure you get the best performance and compatibility for your vehicle. 

Firstly, it’s essential to check the compatibility of the power steering pump with your specific Forester model and year. Each model may have slight variations in the power steering system, so it’s crucial to choose a pump that is designed specifically for your vehicle.

Another important feature to consider is the pump’s durability and reliability. Look for pumps made from high-quality materials and with a sturdy construction that can withstand the demands of daily driving and various weather conditions. Additionally, consider pumps that have been tested for performance and have a good reputation for reliability.

The power steering pump’s pressure output is another crucial factor to consider. Different Forester models may require different levels of hydraulic pressure, so make sure to choose a pump that matches the manufacturer’s specifications for your specific model.

Lastly, consider the noise level of the power steering pump. Some pumps may produce more noise during operation than others. If noise is a concern for you, look for pumps that are designed for quiet operation.

Common Signs Your Subaru WRX Power Steering Pump May Need Replacement

If you drive a Subaru WRX, you know that this high-performance vehicle requires precision and responsiveness when it comes to steering. The Subaru WRX power steering pump plays a vital role in achieving that, but how do you know when it’s time for a replacement? Here are some common signs that your Subaru power steering pump may need to be replaced.

Firstly, if you notice difficulty in turning the wheel, especially at low speeds or when parking, it could be a sign that your power steering pump is failing. The pump assists in turning the wheels by applying hydraulic pressure, so if it’s not functioning properly, you may experience increased effort in steering.

Another sign to look out for is a whining or squealing noise coming from the engine bay when you turn the steering wheel. This could indicate a problem with the power steering pump, such as a worn-out bearing or damaged internal components.

Leaking power steering fluid is another red flag. If you notice fluid dripping or pooling underneath your vehicle, it’s likely that there is a leak in the power steering system. This could be caused by a faulty pump or damaged hoses.

Step-by-step Guide on Replacing Your Power Steering Pump

Replacing your power steering pump may seem like a daunting task, but with this step-by-step guide, you’ll be able to tackle it like a pro. Here’s how to replace your power steering pump:

  1. Gather the necessary tools and materials: Before you begin, make sure you have all the tools and materials you’ll need, including a new power steering pump, a wrench set, a socket set, power steering fluid, and a drain pan.
  2. Locate the power steering pump: The power steering pump is typically located at the front of the engine, connected to the serpentine belt. Consult your vehicle’s manual or do some research to find the exact location.
  3. Remove the old power steering pump: Start by disconnecting the negative battery cable to ensure safety. Then, loosen the tension on the serpentine belt and remove it from the power steering pump pulley. Disconnect any hoses or electrical connections connected to the pump. Finally, remove the bolts holding the pump in place and carefully lift it out.
  4. Install the new power steering pump: Place the new power steering pump in the correct position and secure it with the bolts. Reconnect any hoses or electrical connections that were previously disconnected. Finally, reinstall the serpentine belt and tighten the tension.
  5. Refill with power steering fluid: Locate the power steering fluid reservoir and remove the cap. Use a funnel to slowly pour in the appropriate amount of power steering fluid, as specified in your vehicle’s manual.
  6. Bleed the system: Start the engine and slowly turn the steering wheel from lock to lock several times. This will help remove any air bubbles from the power steering system. Check the fluid level and add more if necessary.
  7. Test for leaks and functionality: Turn off the engine and visually inspect the power steering pump and hoses for any leaks. Then, start the engine again and test the steering to ensure it feels smooth and responsive.

Maintaining Your Power Steering Pump for Long-term Performance

Proper maintenance of your Power Steering Pump is essential for ensuring its long-term performance. By following a few simple steps, you can keep your power steering pump in top shape and avoid costly repairs down the line.

First and foremost, regular fluid checks and changes are crucial for maintaining the health of your power steering pump. Over time, the power steering fluid can become contaminated with debris and moisture, leading to decreased performance and potential damage to the pump. It’s recommended to check the fluid level regularly and replace it according to the manufacturer’s guidelines.

Another important aspect of maintaining your power steering pump is checking for leaks. Leaking fluid can indicate a problem with the pump or the power steering system, and should be addressed immediately. Inspect the power steering pump and hoses for any signs of leakage, such as fluid drips or stains. If you notice any leaks, it’s best to consult a professional mechanic for a thorough inspection and repair.


1. How do I know if my power steering pump is failing?

Common signs of a failing power steering pump include difficulty turning the wheel, whining or squealing noises when turning, leaking power steering fluid, and vibration or excessive play in the steering wheel.

Subaru Forester Power Steering Pump2. Can I replace the power steering pump myself?

While it is possible to replace the power steering pump yourself, it can be a complex task. It’s recommended to have a professional mechanic perform the replacement to ensure it is done correctly.

3. How often should I check and replace the power steering fluid?

It’s recommended to check the power steering fluid level regularly and replace it according to the manufacturer’s guidelines. This is typically done every 30,000 to 60,000 miles.


In this comprehensive guide, we have covered everything you need to know about the Power Steering Pump and how to choose the best one for your vehicle. We discussed the functionality of the Subaru Power Steering Pump and how it assists in providing smooth and effortless control while driving. We also delved into the specific features and capabilities of the Subaru STI Power Steering Pump, designed to handle the demands of this high-performance vehicle.

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