2005-2012 Acura RL Power Steering Pump: Fixing Whine, Leaks, and Stiff Steering

Critical Compatibility: 2005-2008 (3.5L) vs. 2009-2012 (3.7L) Pumps

The most important factor when replacing the power steering pump on a second-generation Acura RL is the engine. The pump changed when Acura updated the engine from the 3.5L V6 to the 3.7L V6. These two pumps are not interchangeable.

Symptoms of a Failing Power Steering Pump

Power steering issues in the Acura RL can manifest in several ways, but one symptom is far more common than others.

Whining or Moaning Noise

This is the most frequent complaint. You may hear a distinct whining or groaning sound that rises and falls with engine RPM. The noise often gets louder when you turn the steering wheel. While this can indicate a failing pump, it is very often caused by air getting into the system through a hardened o-ring, a much simpler fix discussed in the diagnosis section below.

Stiff or Heavy Steering

If the pump fails to generate enough pressure, the steering will feel very heavy, especially at low speeds or when parking. This can happen intermittently at first and worsen over time.

Foamy or Bubbly Fluid

If you check the power steering fluid reservoir while the engine is running and see foam, bubbles, or a frothy appearance, it's a definitive sign that air is being sucked into the system. This is the classic symptom of a bad inlet o-ring.

Leaking Power Steering Fluid

Puddles of reddish or clear fluid under the front of the car are a clear sign of a leak. While the pump itself can leak, it's also crucial to inspect the power steering hoses, as a recall was issued for this exact problem.

Diagnosis: Is It Really the Pump?

A whining noise is most commonly caused by air entering the pump through a cheap, hardened rubber o-ring on the pump's suction inlet hose. Over time, this o-ring flattens and loses its seal, allowing air to be drawn in, which causes the pump to cavitate and whine.

1. Check the Fluid: With the engine off, open the power steering reservoir. The fluid should be a clear, light amber color. If it's dark, burnt-smelling, or has metal particles, the system is contaminated and needs a full flush.
2. Look for Bubbles: Start the engine and let it idle. Look into the reservoir. If you see foam or a stream of bubbles, air is entering the system. This strongly points to the inlet o-ring.
3. Replace the Inlet O-Ring: The o-ring is located where the low-pressure (suction) hose connects to the power steering pump. It is held in place by a single 10mm bolt. The repair takes less than 30 minutes and the part is very inexpensive. The torque for the bolt is only 8 lb-ft (11 N·m), so be careful not to overtighten it.

Known Issues, Recalls, and TSBs

NHTSA Recall 07V551000: Power Steering Hose Leak

Acura issued a major safety recall for 2005-2008 RL models because the power steering feed hose could deteriorate from high under-hood temperatures. This can cause the hose to crack and leak fluid directly onto the hot catalytic converter, creating smoke and a significant risk of an under-hood fire. Symptoms include a burning smell, smoke, and a whining power steering pump due to low fluid levels. The fix involves installing an updated power steering hose kit. Before purchasing a used vehicle, check its VIN on the NHTSA website to see if this recall was completed.

Technical Service Bulletins (TSBs)

While no specific TSB for the RL was found in the search, Acura has released bulletins for other models like the TL (TSB 07-060) for the exact same issue: a whining noise when cold that is resolved by replacing the power steering pump inlet o-ring. The cause and repair procedure are identical for the RL.

Buying a Used 2005-2012 Acura RL Power Steering Pump

If you've ruled out the o-ring and hoses and confirmed the pump is faulty, a used OEM pump can be a cost-effective solution. New OEM pumps for the RL are extremely expensive, making a quality recycled part an attractive option.

• Verification: The most critical step is to match the part to your vehicle's year and engine (3.5L for 2005-2008, 3.7L for 2009-2012). Double-check the OEM part number stamped on the pump housing.
• Physical Inspection: Inspect the used pump for any cracks or damage to the aluminum housing. Check that the pulley (if included) is not bent or cracked. The central shaft should spin smoothly by hand without any grinding, roughness, or excessive play.
• Mileage: Power steering pumps on these vehicles can last well over 100,000 miles, but failure is not uncommon. When buying used, look for a part from a lower-mileage vehicle if possible. However, a well-maintained part from a higher-mileage car is often better than a new, cheap aftermarket alternative.
• Why Used OEM?: Genuine Acura pumps are built to a higher quality standard than many low-cost aftermarket units. A used OEM pump often provides better longevity and a quieter, more reliable performance than a new, unbranded aftermarket part.

Replacement Overview and Procedures

Replacing the power steering pump is a moderately difficult job for a DIY mechanic. Access can be tight, and bleeding the system properly is essential.

• Key Steps: The process involves removing the serpentine belt, draining the fluid, disconnecting the high-pressure and low-pressure hoses, and unbolting the pump from the engine.
• Reuse Your Pulley: Many replacement pumps do not include a pulley. You will likely need to transfer the pulley from your old pump.
• Replace O-Rings: It is mandatory to replace the o-rings on both the inlet and outlet hoses when you replace the pump.
• Bleeding the System: After installation, you must bleed all air from the system. With the front wheels off the ground and the reservoir cap loose, slowly turn the steering wheel from full lock to full lock about 20 times with the engine OFF, adding fluid as the level drops. Then, start the engine and repeat the lock-to-lock turning until the fluid in the reservoir is free of bubbles and the pump is quiet.

Cost Comparison

Frequently Asked Questions (FAQ)