Dorman 603-054 Engine Coolant Reservoir - Front

Overview of Dorman Engine Coolant Reservoir 603-054

The Dorman Engine Coolant Reservoir 603-054 is designed to provide reliable coolant storage and pressure management for select GM trucks and SUVs. Engineered from durable plastic, this reservoir is compatible with various Cadillac, Chevrolet, and GMC models, ensuring proper engine cooling system function.

• Constructed from durable plastic material for long-lasting use
• Measures 311 mm in length and 197 mm in height for precise fitment
• Includes a spring loaded twist cap rated for 14 psi pressure
• Pressurized reservoir design to maintain optimal coolant system pressure
• Comes with 1 coolant reservoir and 1 cap; mounting hardware not included
• Features 2 mounting holes for secure installation

Detailed Product Description

This Dorman Engine Coolant Reservoir 603-054 is a direct replacement part designed to restore the cooling system's efficiency in compatible vehicles. The black and white plastic reservoir is engineered to withstand the thermal and pressure demands of the engine cooling system. The included spring loaded twist cap maintains a maximum pressure rating of 14 psi, helping to prevent coolant loss and overheating. With two mounting holes, the reservoir can be securely installed in the engine bay, although mounting brackets and hardware are not included. This part is compatible with a range of Cadillac, Chevrolet, and GMC models including the Avalanche, Cheyenne, Escalade (including ESV and EXT), Sierra (1500, 2500 HD, 3500 HD), Silverado (1500, 2500, 2500 HD, 3500, 3500 HD), Suburban (1500, 2500), Tahoe, Yukon, and Yukon XL (1500, 2500).

Common Applications and Issues Addressed

• Replacement of cracked or leaking coolant reservoirs in Chevrolet Silverado 1500 and GMC Sierra 2500 HD
• Restoring proper coolant pressure in Cadillac Escalade and Yukon XL 2500 models
• Resolving coolant overflow or loss due to faulty reservoir caps
• Addressing engine overheating caused by coolant reservoir failure
• Fixing mounting issues related to damaged or missing coolant tanks in Chevrolet Avalanche and Suburban 1500

Installation Notes and Tips

• Ensure the engine is cool before removing the old coolant reservoir to avoid burns
• Check that the mounting holes align properly with the vehicle’s frame for secure installation
• Use the included spring loaded twist cap to maintain system pressure; do not reuse old caps
• Inspect hoses connected to the reservoir for wear or damage and replace if necessary
• Bleed the cooling system after installation to remove air pockets and ensure proper coolant flow

Quality Assurance and Warranty

Dorman manufactures this engine coolant reservoir to meet or exceed OEM specifications for fit, form, and function. The part number 603-054 undergoes quality control testing to ensure durability and pressure resistance. While mounting hardware is not included, the reservoir and cap are designed for reliable performance under normal operating conditions. Warranty coverage details should be confirmed with the point of purchase or manufacturer documentation.