Dorman 603-425 Engine Coolant Reservoir - Front

Overview of Dorman Engine Coolant Reservoir 603-425

The Dorman 603-425 engine coolant reservoir is designed for reliable coolant storage and overflow management in select Lexus and Toyota vehicles. This plastic reservoir is compatible with models such as the Lexus GX470 and Toyota 4Runner and FJ Cruiser, providing a precise fit and essential cooling system support.

• Constructed from durable white plastic material
• Dimensions: 256 mm length and 178 mm height for accurate fitment
• Includes one coolant reservoir and one flip-top cap
• Equipped with three mounting holes for secure installation
• Non-pressurized design with included cap for proper coolant containment
• Mounting hardware and brackets are not included

Detailed Product Description

The Dorman 603-425 engine coolant reservoir is engineered to meet the cooling system requirements of Lexus GX470 and Toyota 4Runner and FJ Cruiser models. Made from sturdy plastic, this reservoir offers resistance to heat and corrosion, ensuring long-term durability. Its white color allows for easy coolant level inspection, while the flip-top cap facilitates convenient access for refilling and maintenance. The reservoir features three mounting holes, allowing for a secure fit without included brackets or hardware, which may need to be reused from the original part.

Compatible Vehicles and Applications

This engine coolant reservoir is compatible with the following vehicles:

• Lexus GX470
• Toyota 4Runner
• Toyota FJ Cruiser

It is designed to replace the original coolant reservoir in these models, ensuring proper coolant overflow management and system performance.

Common Issues Addressed by This Reservoir

• Coolant leaks due to cracked or damaged reservoirs
• Overheating caused by insufficient coolant containment
• Coolant level monitoring difficulties from discolored or opaque tanks
• Failure of the original cap leading to pressure loss or coolant evaporation
• Replacement of worn or brittle plastic reservoirs to maintain system integrity

Installation Notes and Tips

• Verify compatibility with your Lexus or Toyota model before installation
• Reuse existing mounting hardware and brackets as they are not included
• Ensure the flip-top cap is securely fastened to prevent leaks
• Inspect coolant hoses and connections during installation for wear or damage
• Follow vehicle manufacturer guidelines for coolant system maintenance

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The 603-425 engine coolant reservoir undergoes quality checks to ensure durability and performance. While specific warranty details may vary, Dorman typically offers limited warranties covering defects in material and workmanship. Consult product documentation or the manufacturer for exact warranty terms.