Dorman 603-258 Engine Coolant Reservoir - Front

Overview of Dorman Engine Coolant Reservoir for Mercedes-Benz

The Dorman 603-258 engine coolant reservoir is designed specifically for select Mercedes-Benz models including the ML55 AMG, ML320, ML350, ML430, and ML500. This clear plastic coolant reservoir offers a reliable solution for maintaining proper engine temperature and fluid levels in your vehicle's cooling system.

• Material: Durable clear plastic construction
• Capacity: 3.75 liters to accommodate cooling system needs
• Dimensions: 10 inches in length and 6 inches in height
• Includes mounting brackets and a pressurized cap rated up to 20 psi
• Features 2 mounting holes for secure installation
• Cap included with the reservoir for a complete replacement

Detailed Product Description

The Dorman 603-258 engine coolant reservoir is engineered to meet the specifications required by Mercedes-Benz ML-Class vehicles such as the ML55 AMG, ML320, ML350, ML430, and ML500. Constructed from clear plastic, this reservoir allows for easy monitoring of coolant levels without removing the cap. Its irregular shape is designed to fit precisely within the engine bay, optimizing space and compatibility. The included mounting brackets and two mounting holes ensure a secure fit, while the pressurized cap, rated for a maximum pressure of 20 psi, helps maintain the correct pressure within the cooling system to prevent overheating and coolant loss.

Common Applications and Issues Addressed

• Replacement for cracked or leaking coolant reservoirs
• Restores proper coolant level monitoring and containment
• Prevents engine overheating caused by coolant loss
• Eliminates coolant contamination from damaged or worn reservoirs
• Ensures proper pressure regulation within the cooling system

Installation Notes and Tips

Installation of the Dorman 603-258 reservoir requires basic mechanical skills. Ensure the engine is cool before beginning the replacement to avoid injury from hot coolant. Remove the old reservoir by disconnecting the mounting brackets and hoses carefully. Install the new reservoir using the included mounting brackets and secure it with the two mounting holes. Attach the pressurized cap firmly to maintain system integrity. After installation, refill the cooling system with the appropriate coolant and check for leaks. It is recommended to bleed the cooling system to remove any trapped air for optimal performance.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The 603-258 engine coolant reservoir undergoes rigorous quality control to ensure durability and reliability in demanding automotive environments. While specific warranty details may vary, Dorman typically offers a limited warranty covering defects in material and workmanship. Consult product documentation or contact the distributor for exact warranty terms.