Dorman 603-782 Engine Coolant Reservoir - Front

Overview of Dorman Engine Coolant Reservoir 603-782

The Dorman 603-782 engine coolant reservoir is designed specifically for select Lexus and Toyota hybrid models, including the CT200h, HS250h, Prius, Prius Plug-In, and Prius V. This replacement reservoir ensures proper coolant storage and system performance with a clear plastic construction and included mounting hardware.

• Material: Durable clear plastic with metal components
• Dimensions: 11.5 inches length, 8.5 inches height
• Capacity: 1 liter coolant volume
• Includes mounting hardware and a pressure cap rated up to 16 psi
• Features 4 mounting holes for secure installation
• Non-pressurized reservoir with irregular shape for precise fitment
• Cap included with maximum pressure rating of 16 psi

Detailed Product Description

The Dorman 603-782 engine coolant reservoir is engineered to meet the specifications of Lexus and Toyota hybrid vehicles such as the CT200h, HS250h, Prius, Prius Plug-In, and Prius V. Constructed primarily from clear plastic, this reservoir allows for easy visual inspection of coolant levels. The metal components add strength and durability, while the irregular shape is designed to fit precisely within the engine bay of the specified models. Measuring 11.5 inches in length and 8.5 inches in height, it holds up to 1 liter of coolant. The included cap is rated for a maximum pressure of 16 psi, ensuring safe operation within the cooling system. Four mounting holes and included hardware facilitate straightforward installation without the need for additional brackets.

Compatible Vehicles and Common Applications

This engine coolant reservoir is compatible with the following vehicles:

• Lexus CT200h
• Lexus HS250h
• Toyota Prius (standard and Plug-In)
• Toyota Prius V

It is designed to address issues such as:

• Coolant leaks due to cracked or damaged reservoirs
• Inaccurate coolant level readings from worn or discolored tanks
• Overheating caused by insufficient coolant storage
• Pressure loss in the cooling system from faulty caps
• Corrosion or wear in original reservoir components

Installation Notes and Tips

Installation of the Dorman 603-782 reservoir is straightforward with the included mounting hardware. Ensure the engine is cool before beginning replacement to avoid injury from hot coolant. Drain the existing coolant as needed, remove the old reservoir, and clean the mounting area. Align the new reservoir using the four mounting holes and secure it firmly. Install the included pressure cap, verifying it seats properly to maintain system pressure. After installation, refill the cooling system with the appropriate coolant and check for leaks during operation.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The 603-782 engine coolant reservoir undergoes quality inspections to ensure durability and reliability. This part includes a cap with a maximum pressure rating of 16 psi to maintain proper cooling system performance. Please refer to Dorman's warranty policy for specific coverage details.