Dorman Power Steering Reservoir with Cap — Direct-Fit for Acura MDX / Honda Pilot / Ridgeline, Heat-Resistant and Vibration-Resist

The Dorman 603-709 power steering reservoir with cap is a direct-fit replacement tank designed to restore your Acura or Honda's steering fluid containment and maintain reliable under-hood performance.

This replacement reservoir is engineered to match the original equipment's fit and function while resisting under-hood heat and vibration. Manufactured from durable materials and validated through on-vehicle testing, it arrives as a complete assembly with its cap so you can replace a worn, cracked, or leaking reservoir without modifying your vehicle. Before ordering, confirm compatibility by entering your vehicle trim in the garage tool to ensure exact fitment for supported Acura MDX, Honda Pilot, and Honda Ridgeline years.

Will this reservoir fit my specific Acura or Honda model?

This Dorman reservoir is produced to match the factory dimensions and mounting points of the listed applications. Compatibility varies by year and trim, so verifying your vehicle details is important to avoid returns or fit issues.

• Compatible models include Acura MDX (2003–2004), Honda Pilot (2005–2008), and Honda Ridgeline (2006–2014).
• Use the garage tool on the product page and enter make, model, and trim to confirm fitment.
• Designed to align with original mounting locations and hose connections for a straightforward replacement.

How durable is this replacement reservoir under normal driving conditions?

Dorman builds this reservoir from heat- and vibration-resistant materials to withstand the stresses of everyday engine compartments. The part has been subjected to on-vehicle testing to ensure it meets durability expectations for typical road use.

• Materials chosen for thermal stability and resistance to cracking from engine heat.
• Vibration-resistant construction to endure long service intervals.
• Tested on vehicles to confirm longevity and proper sealing under real-world conditions.

What comes in the box, and is installation complicated?

The unit ships as a complete assembly containing the reservoir and its cap, removing the need to source separate components. Installation is intended to mirror the original equipment replacement process, and should be straightforward for anyone with basic automotive repair experience.

• Complete assembly includes reservoir and reservoir cap—no additional parts required for a standard swap.
• Direct replacement format aligns with factory mounting points for a trouble-free install.
• Expect standard hand tools and routine steps: drain fluid if needed, disconnect hoses, unfasten mount, swap reservoir, and refill with correct fluid type.

Will using this reservoir affect steering performance?

The reservoir itself does not change steering system operation but ensures the system retains the proper fluid and pressure by preventing leaks and contamination. Replacing a damaged reservoir helps maintain consistent fluid levels and supports normal power steering function.

• Restores secure fluid containment to prevent low-fluid symptoms like noise or reduced assist.
• Cap included to maintain system sealing and reduce contamination risk.
• Helps preserve original hydraulic characteristics by matching OE fitment.

Who is this for: This Dorman 603-709 reservoir is intended for owners, DIY mechanics, and independent repair shops working on compatible Acura MDX, Honda Pilot, or Honda Ridgeline vehicles that need a reliable, direct-fit replacement. Choose this part if your current reservoir shows cracks, leaks, warped mounting points, or a damaged cap and you want an affordable, tested replacement that aligns with factory specifications.