Dorman 603-142 Engine Coolant Reservoir - Front

Reliable Engine Coolant Reservoir for Chevrolet and GMC Trucks

The Dorman 603-142 engine coolant reservoir is designed to maintain optimal cooling system performance for heavy-duty Chevrolet and GMC trucks. Engineered with durable plastic and a pressurized cap, this reservoir supports efficient coolant management in demanding driving conditions.

Key Features of the Dorman 603-142 Coolant Reservoir

• Constructed from durable plastic for long-lasting use
• Black and white color for easy coolant level visibility
• Includes a spring loaded twist cap rated for 20 psi pressure
• Pressurized design to maintain proper cooling system pressure
• Comes with one mounting hole for secure installation
• Cap included with the reservoir for a complete replacement

Detailed Description

The Dorman 603-142 engine coolant reservoir is specifically designed for Chevrolet Silverado 2500 HD, Silverado 3500 HD, GMC Sierra 2500 HD, and Sierra 3500 HD models. Made from high-quality plastic, this reservoir withstands heat and pressure to ensure reliable coolant storage and circulation. The included spring loaded twist cap is pressurized up to 20 psi, helping maintain the correct pressure within the cooling system to prevent overheating and coolant loss. The black and white reservoir allows for quick visual checks of coolant levels, aiding in routine maintenance. This part number 603-142 provides a direct replacement solution for worn or damaged coolant reservoirs in compatible heavy-duty trucks.

Common Issues Addressed by This Coolant Reservoir

• Coolant leaks due to cracked or damaged reservoir tanks
• Loss of cooling system pressure causing engine overheating
• Inaccurate coolant level readings from faded or discolored reservoirs
• Failure of the reservoir cap leading to coolant evaporation
• Replacement of worn or brittle plastic reservoirs in older trucks

Installation Notes and Tips

When installing the Dorman 603-142 coolant reservoir, ensure the mounting hole aligns properly with the vehicle’s bracket. Since mounting hardware is not included, reuse existing bolts or purchase compatible fasteners separately. Carefully tighten the spring loaded twist cap to maintain the 20 psi pressure rating. Inspect hoses connected to the reservoir for wear or damage during installation to prevent future leaks. Always allow the engine to cool before removing the old reservoir to avoid injury from hot coolant.

Quality Assurance and Warranty

Dorman manufactures the 603-142 engine coolant reservoir to meet or exceed OEM specifications for Chevrolet and GMC heavy-duty trucks. The part undergoes rigorous quality control to ensure durability and fitment accuracy. This product includes a manufacturer warranty covering defects in materials and workmanship, providing confidence in its reliability for your Silverado 2500 HD, Silverado 3500 HD, Sierra 2500 HD, or Sierra 3500 HD.