CSF 3938 Radiator

CSF 3938 Auxiliary Radiator for Silverado and Sierra HD

CSF 3938 is an auxiliary radiator built for heavy-duty cooling support in select Chevrolet Silverado 2500 HD and 3500 HD, as well as GMC Sierra 2500 HD and 3500 HD applications. It uses an aluminum core with a cross-flow design to match OE-style packaging and cooling layout.

Key Features

• Aluminum core construction for efficient heat transfer
• Cross-flow radiator design
• 5/8 in. core thickness
• 37 5/8 in. core length and 3 in. core width
• Single-row core configuration
• OE-style auxiliary radiator application for select GM HD trucks
• Part number 3938 for easy identification

Product Details

CSF 3938 is engineered as an auxiliary radiator for 2020-2026 Chevrolet Silverado 2500 HD and Silverado 3500 HD, plus 2020-2026 GMC Sierra 2500 HD and Sierra 3500 HD. The aluminum core and cross-flow layout are designed to follow the factory cooling architecture, making this radiator a direct-fit service part for trucks that need supplemental thermal management. CSF states its radiators are built to high-performance standards, validated through laboratory wind-tunnel testing, and produced in ISO/TSO-certified facilities. This part cross-references Monroe Shocks & Struts (e.g., 84098260, GM3010627) for the same application.

Common Uses

• Replacing a damaged auxiliary radiator on a Silverado 2500 HD or Silverado 3500 HD
• Restoring cooling performance in a Sierra 2500 HD or Sierra 3500 HD
• Addressing coolant leaks from a cracked or corroded radiator core
• Correcting overheating concerns tied to reduced auxiliary cooling capacity
• Returning the factory cooling system layout to OE-style operation

Installation Notes

Verify vehicle year, make, model, and OE-style auxiliary radiator configuration before installation. This radiator does not include a cap. Confirm all hose routing, mounting points, and surrounding cooling components are in good condition before final assembly. Part number 3938 should be matched to the vehicle application listed above for proper fitment.

Quality Assurance

CSF has supplied radiators worldwide for more than 50 years and manufactures a broad range of cooling products for major vehicle platforms. The brand’s production process includes engineering validation and lab testing focused on cooling performance.