Dorman 626-661 Engine Coolant Pipe

Engine Coolant Pipe for HD GM Applications

Dorman 626-661 is an engine coolant pipe built to match the original pipe’s fit and function on specified Chevrolet and GMC trucks and vans. It is designed for leak-free coolant transfer when the factory pipe has failed from heat exposure or corrosion.

• Steel construction with black epoxy finish for corrosion resistance
• Flange end and O-ring end design for OE-style sealing
• Branched coolant hose pipe layout for specified cooling system routing
• Mounting bracket included for proper support and alignment
• Maximum working pressure: 50 PSI
• Direct replacement for Dorman 626-661

Fitment and Application

Compatible with 2001-2025 Chevrolet Silverado 2500 HD, N/A; 2007-2025 Chevrolet Silverado 3500 HD, N/A; 2001-2025 GMC Sierra 2500 HD, N/A; 2007-2025 GMC Sierra 3500 HD, N/A; 2006-2016 Chevrolet Express 2500, N/A; 2006-2016 Chevrolet Express 3500, N/A; 2006-2016 GMC Savana 2500, N/A; 2006-2016 GMC Savana 3500, N/A; 2007 Chevrolet Silverado 2500 HD Classic, N/A; 2007 Chevrolet Silverado 3500 Classic, N/A; 2007 GMC Sierra 2500 HD Classic, N/A; 2007 GMC Sierra 3500 Classic, N/A; 2001-2006 Chevrolet Silverado 3500, N/A; 2001-2006 GMC Sierra 3500, N/A.

This part cross-references GM OE numbers 12636733 and 12725092 for the same application.

What It Helps Fix

• Coolant leaks caused by a cracked or corroded original pipe
• Loss of coolant transfer through the engine cooling system
• Improper sealing at the flange or O-ring connection points
• Cooling system service issues on Silverado 2500 HD, Sierra 3500 HD, Express, and Savana models
• Fitment problems from a damaged or distorted factory coolant tube

Installation Notes

Verify the flange and O-ring interfaces before installation and replace the required seal during service. Confirm the pipe routing, bracket location, and hose-end dimensions against the original part before assembly on Chevrolet Silverado, GMC Sierra, Chevrolet Express, and GMC Savana applications.

Quality Assurance

Dorman engineers this coolant pipe as an OE-style replacement for specified vehicles, with steel construction and a black epoxy coating to help resist corrosion in demanding cooling-system environments.