Dorman 603-861 Engine Coolant Reservoir

Reliable Engine Coolant Reservoir for Select GM Vehicles

The Dorman 603-861 engine coolant reservoir is designed to maintain optimal coolant levels and pressure in your vehicle's cooling system. Engineered from durable plastic with a spherical shape, this reservoir is compatible with various Buick, Cadillac, Chevrolet, and GMC models, ensuring proper fit and function.

• Constructed from durable white plastic for corrosion resistance
• Spherical shape with dimensions of 7 inches in length and height
• Threaded cap included with a maximum pressure rating of 20 psi
• Pressurized reservoir designed to maintain system integrity
• Capacity of 1.5 liters (15 maximum capacity units)
• Equipped with three mounting holes for secure installation

Product Details and Specifications

The Dorman 603-861 engine coolant reservoir features a pressurized design to help maintain the correct pressure within the cooling system, which is critical for preventing overheating and coolant loss. Its white plastic construction offers resistance to heat and corrosion, extending the service life of the component. The reservoir includes a threaded cap rated for up to 20 psi, ensuring a secure seal and proper pressure management. With a capacity of 1.5 liters, it provides adequate coolant storage for efficient engine temperature regulation. The spherical shape and three mounting holes allow for a stable and precise fit in the engine bay.

Compatible Vehicles and Applications

This engine coolant reservoir is compatible with a range of GM vehicles, including:

• Buick LaCrosse, Regal Sportback, Regal TourX
• Cadillac XT4, XT5, XT6, Envision
• Chevrolet Malibu, Equinox, Blazer
• GMC Acadia, Terrain, Canyon, Colorado

Use this reservoir to replace worn or damaged coolant tanks in these models to maintain proper coolant levels and system pressure.

Common Issues Addressed by This Reservoir

• Coolant leaks due to cracked or damaged reservoir tanks
• Loss of coolant pressure causing engine overheating
• Faulty or missing reservoir caps leading to coolant evaporation
• Inaccurate coolant level readings from damaged reservoirs
• Corrosion or wear compromising coolant containment

Installation Notes and Tips

When installing the Dorman 603-861 engine coolant reservoir, ensure the mounting surface is clean and free of debris. Align the reservoir using the three mounting holes for a secure fit. The threaded cap included should be tightened to the manufacturer's specifications to maintain proper pressure. Note that mounting hardware is not included and may need to be reused or sourced separately. Always check for leaks after installation and refill the coolant to the recommended level.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The 603-861 engine coolant reservoir undergoes rigorous quality control to ensure durability and reliability. While specific warranty details are not provided here, Dorman typically offers limited warranties on their replacement parts. Consult product documentation or the supplier for exact warranty terms.