Dorman 603-840 Engine Coolant Reservoir

Reliable Engine Coolant Reservoir for Ram 2500, 3500, and 4000

The Dorman 603-840 engine coolant reservoir is designed to maintain optimal coolant levels and pressure in your Ram 2500, 3500, and 4000 models. Constructed from durable plastic with a clear finish, this reservoir allows for easy monitoring of coolant levels while ensuring reliable performance under pressurized conditions.

• Material: Durable plastic construction with clear color for visibility
• Dimensions: 11.5 inches length and 12.5 inches height
• Capacity: Holds up to 2.5 liters of coolant
• Pressurized design with a twist cap rated for 20 psi maximum pressure
• Includes mounting brackets and cap; no mounting hardware included
• Features two mounting holes and an irregular shape for precise fitment
• Compatible with Ram 2500, 3500, and 4000 models

Detailed Description of Dorman 603-840 Coolant Reservoir

This engine coolant reservoir from Dorman is engineered to meet the specific requirements of Ram heavy-duty trucks, including the 2500, 3500, and 4000 series. The clear plastic material allows for quick visual inspection of coolant levels without removing the cap. Its pressurized design supports system pressure up to 20 psi, helping to prevent coolant loss and maintain engine temperature stability. The included twist cap seals the system effectively, while the two mounting holes and included brackets ensure secure installation in the engine bay. The irregular shape is tailored to fit the designated Ram models, providing a direct replacement for the original reservoir.

Common Applications and Problem Resolution

• Replaces cracked or leaking coolant reservoirs
• Restores proper coolant level monitoring
• Prevents coolant overflow and engine overheating
• Maintains system pressure to avoid coolant loss
• Addresses damaged or missing reservoir caps

Installation Notes and Tips

Installation of the Dorman 603-840 coolant reservoir requires removal of the old reservoir and securing the new unit using the included mounting brackets and existing hardware. Note that mounting hardware is not included, so original bolts or screws should be reused. Ensure the twist cap is properly tightened to maintain system pressure. It is recommended to inspect hoses and connections during installation for any signs of wear or leaks.

Quality Assurance and Warranty Information

Dorman manufactures this engine coolant reservoir to meet or exceed OEM specifications for fit, form, and function. The part number 603-840 is backed by Dorman's quality standards, providing reliable performance for Ram 2500, 3500, and 4000 vehicles. Warranty details can be obtained directly from Dorman or authorized distributors.