Dorman 904-121 EGR Cooler

Durable Stainless Steel EGR Cooler for Chevrolet and GMC Trucks

The Dorman 904-121 Exhaust Gas Recirculation (EGR) Cooler is engineered specifically for select Chevrolet and GMC heavy-duty trucks. Constructed from stainless steel with a silver finish, this EGR cooler is designed to meet stringent emission standards while providing reliable performance.

• Material: High-quality stainless steel for corrosion resistance
• Color: Silver finish
• Overall dimensions: 13.5 inches length, 4.19 inches height, 3.16 inches width
• Includes 1 EGR cooler, 4 gaskets, 4 hose clamps, and 2 hoses for complete installation
• Specific fitment for Chevrolet and GMC Sierra and Silverado 2500 HD and 3500 models
• CARB certified with Executive Order Number D740 for compliance in California
• Port diameters: 0.52 inches inside diameter for both inlet and outlet
• Non-flanged design for direct replacement
• Gasket and seal included to ensure proper sealing and prevent leaks

Product Details and Compatibility

The Dorman 904-121 EGR Cooler is designed to fit specific heavy-duty Chevrolet and GMC trucks, including the Sierra 2500 HD, Sierra 2500 HD Classic, Sierra 3500, Sierra 3500 Classic, Silverado 2500 HD, Silverado 2500 HD Classic, Silverado 3500, and Silverado 3500 Classic models. This part is engineered to replace the original equipment with exact dimensions and port sizes, ensuring a precise fit and optimal function. The stainless steel construction offers durability and resistance to the high temperatures and corrosive gases encountered in the EGR system.

Purpose and Common Issues Addressed

• Reduces exhaust gas temperatures to prevent engine overheating
• Helps maintain proper EGR system function to reduce NOx emissions
• Prevents coolant leaks and exhaust gas leaks in the EGR cooler assembly
• Addresses engine performance issues related to faulty or clogged EGR coolers
• Supports compliance with emission regulations, including California Air Resources Board standards

Installation Notes and Tips

Installation of the Dorman 904-121 EGR Cooler includes all necessary gaskets, hose clamps, and hoses for a complete replacement. Ensure the engine is cool before beginning installation to avoid injury. Carefully remove the old EGR cooler and clean the mounting surfaces to prevent leaks. Verify all hose connections are secure and clamps are tightened to manufacturer specifications. This part is designed for a direct fit on compatible Chevrolet and GMC models, but professional installation is recommended for best results.

Quality Assurance and Certification

This EGR cooler is CARB certified under Executive Order Number D740, ensuring it meets California emission standards. Manufactured by Dorman, a trusted name in automotive replacement parts, the 904-121 model is built to provide reliable operation and durability. The inclusion of all necessary seals and hardware supports a proper installation and long service life.