Dorman 603-781 Engine Coolant Reservoir - Front

Overview of Dorman Engine Coolant Reservoir 603-781

The Dorman 603-781 engine coolant reservoir is designed for reliable performance in select Lexus and Toyota vehicles, including the Avalon, Camry, and ES350 models. This replacement reservoir is constructed from durable plastic and features a flip-top cap for easy access and maintenance.

• Material: Durable plastic construction
• Dimensions: 15.25 inches length, 5.31 inches height
• Color: Black and clear for easy fluid level monitoring
• Cap type: Flip top, included with the reservoir
• Mounting: Two mounting holes; hardware and brackets not included
• Capacity: 700 ml coolant volume
• Non-pressurized design without level sensor
• Package includes: 1 coolant reservoir, 1 cap, and tubing

Detailed Product Description

The Dorman 603-781 engine coolant reservoir is engineered to meet the specifications required for proper coolant storage and overflow management in Lexus Avalon, Toyota Camry, and Toyota ES350 vehicles. Its irregular shape is designed to fit precisely within the engine bay, ensuring compatibility and ease of installation. The black and clear plastic body allows for quick visual checks of coolant levels without removing the cap. The flip-top cap included with the reservoir provides a secure seal while allowing convenient access for refilling or inspection. Although mounting hardware and brackets are not included, the reservoir features two mounting holes to facilitate secure attachment using existing vehicle components.

Common Applications and Problem Resolution

• Replacement for cracked or leaking coolant reservoirs
• Solves coolant overflow and leakage issues
• Prevents engine overheating caused by insufficient coolant storage
• Restores proper coolant level monitoring capability
• Addresses reservoir damage from wear or impact

Installation Notes and Tips

• Compatible with Lexus Avalon, Toyota Camry, and ES350 models; verify fitment before installation
• Use existing mounting hardware or brackets as they are not included
• Ensure the flip-top cap is securely closed to prevent coolant leaks
• Inspect and replace any damaged tubing during installation
• Check coolant levels after installation and top off as necessary

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The 603-781 engine coolant reservoir undergoes quality inspections to ensure durability and performance. While specific warranty details may vary, Dorman typically offers limited warranties covering defects in material and workmanship. Refer to Dorman’s official warranty policy for complete information.