Dorman Front Pressurized Coolant Reservoir for Chrysler & Dodge (2005–2010) — Direct-Fit, Cap Interface

Dorman 603-056 is a direct-fit, pressurized front coolant reservoir with cap designed to replace the factory overflow tank on select Chrysler and Dodge models.

This replacement coolant reservoir is engineered to restore the cooling system’s expansion and recovery function while matching the original mounting points and hose connections. Molded from heat- and vibration-resistant materials, the tank includes the pressurized cap interface and is built to install cleanly without modification. Before ordering, verify fitment for your exact year, make, and trim using your vehicle information to ensure compatibility with Chrysler 300, Dodge Challenger, Charger, and Magnum model years listed for this part.

Will this reservoir fit my vehicle and how do I confirm it?

Compatibility depends on model year and trim; the part was made for specific Chrysler 300, Dodge Challenger, Charger, and Magnum years. Use the seller’s garage or fitment tool and enter your vehicle VIN or trim information to confirm correct alignment of mounting points and hose sizes.

• Fits listed model years: Chrysler 300 (2005–2010), Dodge Challenger (2008–2010), Charger (2006–2010), Magnum (2005–2008)
• Confirm with VIN or trim via the fitment tool before purchase
• Designed to match factory mounting tabs and hose fittings

How does this Dorman tank compare to the original equipment part?

This Dorman reservoir is built as a direct replacement, engineered to match the original part’s fit and function. Materials and construction resist underhood heat and vibration to deliver a similar service life and performance when installed properly.

• Direct replacement mold and mounting match factory geometry
• Durable thermoplastic resists heat and stress from engine vibrations
• Includes pressurized cap interface for correct cooling system operation

What should I expect during installation and maintenance?

Installation is intended to be straightforward for anyone familiar with basic cooling-system work: drain a portion of coolant, unclip the old tank, swap hoses and sensors, and mount the new tank in place. After filling, bleed air from the system as recommended by the vehicle manufacturer and check for leaks at hose connections and the cap seal.

• Requires basic tools and safe coolant-handling practices
• Replace hoses or clamps if they appear worn during installation
• Test system pressure and inspect cap seal after installation

What are the key benefits of choosing this Dorman replacement?

Opting for this Dorman reservoir restores proper coolant expansion and recovery, prevents overflows, and keeps the cooling system operating reliably without custom modifications. The part’s construction and fitment focus on a hassle-free swap while leveraging Dorman’s aftermarket design and validation.

• Engineered for seamless, bolt-in replacement
• Materials chosen for underhood durability and long-term reliability
• Backed by Dorman’s aftermarket engineering and support

Who is this for: This Dorman 603-056 front pressurized coolant reservoir is intended for owners and technicians working on compatible Chrysler 300, Dodge Challenger, Charger, and Magnum vehicles who need a reliable, direct-fit replacement. It’s suitable for DIYers comfortable with basic coolant system service and professional installers seeking a quality aftermarket option that matches factory fit and function.