Dorman 603-339 Engine Coolant Reservoir - Front

Overview of Dorman Engine Coolant Reservoir 603-339

The Dorman 603-339 engine coolant reservoir is designed specifically for Ford Expedition and Lincoln Navigator models. This pressurized reservoir helps maintain optimal engine temperature by securely storing and managing coolant flow.

• Material: Durable plastic construction
• Dimensions: 18.5 inches length, 14.5 inches height
• Color: Black and clear for easy coolant level monitoring
• Includes mounting brackets and a pressurized cap rated up to 16 psi
• Capacity: 4 liters
• One mounting hole for secure installation
• Cap included with the reservoir

Detailed Product Description

The Dorman 603-339 engine coolant reservoir is engineered to meet the cooling system requirements of Ford Expedition and Lincoln Navigator vehicles. Made from high-quality plastic, this reservoir features an irregular shape designed to fit precisely within the engine bay. The black and clear coloration allows for quick visual inspection of coolant levels without removal. It comes with mounting brackets and a single mounting hole to ensure a stable and secure fit. The included pressurized cap, rated for a maximum pressure of 16 psi, helps maintain system pressure and prevents coolant loss during engine operation. With a 4-liter capacity, this reservoir supports efficient coolant storage and circulation.

Common Applications and Issues Addressed

• Replacement for cracked or leaking coolant reservoirs
• Restores proper coolant pressure and prevents overheating
• Eliminates coolant contamination from damaged or worn reservoirs
• Prevents coolant loss due to faulty or missing caps
• Ensures accurate coolant level monitoring with clear reservoir design

Installation Notes and Tips

Installation of the Dorman 603-339 reservoir requires removal of the old reservoir and securing the new unit using the included mounting brackets and single mounting hole. Ensure the pressurized cap is properly seated to maintain system pressure. No additional mounting hardware is included, so retain original fasteners if possible. Verify coolant levels after installation and check for leaks during initial engine operation.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM specifications for fit, form, and function. The 603-339 engine coolant reservoir undergoes rigorous quality control to ensure durability and reliability. While specific warranty details may vary, Dorman typically offers limited warranties covering defects in material and workmanship.