Dorman 603-812 Engine Coolant Reservoir - Front

Reliable Engine Coolant Reservoir for Mercedes-Benz Models

The Dorman 603-812 engine coolant reservoir is designed to maintain optimal cooling system performance for select Mercedes-Benz vehicles. Engineered with durable plastic and equipped with a spring loaded twist cap, this reservoir supports pressurized cooling systems to help prevent overheating.

• Constructed from durable plastic material for long-lasting use
• Black and white color for easy fluid level monitoring
• Includes one mounting bracket and one mounting hole for secure installation
• Comes with a spring loaded twist cap rated for 20 psi maximum pressure
• Cap and reservoir included in the package for complete replacement
• Compatible with pressurized cooling systems

Product Details and Specifications

The Dorman 603-812 engine coolant reservoir is specifically designed for Mercedes-Benz E55 AMG, E280, E320, E420, and E430 models. Its plastic construction ensures resistance to corrosion and heat, while the black and white color scheme allows for quick visual checks of coolant levels. The included spring loaded twist cap is rated to handle up to 20 psi, supporting the pressurized cooling system requirements of these vehicles. Installation is simplified with one mounting hole and an included mounting bracket, although mounting hardware is not provided.

Compatible Mercedes-Benz Models and Applications

This engine coolant reservoir is compatible with the following Mercedes-Benz models:

• Mercedes-Benz E55 AMG
• Mercedes-Benz E280
• Mercedes-Benz E320
• Mercedes-Benz E420
• Mercedes-Benz E430

Common Cooling System Issues Addressed

• Coolant leaks due to cracked or damaged reservoirs
• Overheating caused by insufficient coolant capacity
• Pressure loss in the cooling system affecting engine temperature regulation
• Difficulty monitoring coolant levels without a clear reservoir
• Failure of old or worn reservoir caps leading to coolant evaporation

Installation Notes and Tips

Before installation, ensure the engine is cool to avoid injury from hot coolant. The Dorman 603-812 reservoir includes one mounting bracket and one mounting hole; however, mounting hardware is not included and may need to be sourced separately. Carefully remove the old reservoir and cap, then install the new reservoir securely using the bracket. Confirm the spring loaded twist cap is properly seated to maintain system pressure. After installation, refill the cooling system with the appropriate coolant and check for leaks.

Quality Assurance and Warranty Information

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The 603-812 engine coolant reservoir undergoes quality inspections to ensure durability and reliability in demanding automotive environments. While specific warranty details may vary, Dorman typically offers limited warranties covering defects in material and workmanship.