CSF 3661 Radiator

CSF 3661 Radiator for Sprinter Cooling Service

The CSF 3661 is an OE-style radiator built with a plastic tank and aluminum core for the 2003-2006 Dodge Sprinter 2500 and 2003-2006 Dodge Sprinter 3500. It follows the original cross-flow layout and factory-style inlet and outlet placement for straightforward replacement service.

CSF’s radiator line is engineered to high-performance standards and validated through wind tunnel testing. The brand manufactures a wide range of radiator applications for major vehicle platforms, and the 3661 reflects that OE-style approach for Dodge Sprinter 2500 and Sprinter 3500 cooling system repair.

Key Features

• Part number: CSF 3661
• OE-style plastic tank and aluminum core construction
• Cross-flow design with 1-row core
• Core thickness: 1 5/8 in.
• Core dimensions: 26 11/16 in. length, 16 1/16 in. width
• Inlet diameter: 1 5/8 in. left
• Outlet diameter: 1 5/8 in. right
• High-efficiency plate-type oil cooler: 10 13/16 in.
• Cap not included
• Fits 2003-2006 Dodge Sprinter 2500 and 2003-2006 Dodge Sprinter 3500

Detailed Description

Built for direct replacement service, the CSF 3661 radiator uses an aluminum core with plastic tanks to match the original equipment style used on the Dodge Sprinter platform. The cross-flow configuration, single-row core, and factory-style inlet and outlet locations support proper coolant routing and packaging in the engine bay. For buyers searching for a Dodge Sprinter 2500 radiator or Dodge Sprinter 3500 radiator replacement, CSF 3661 provides the correct OE-style layout for the listed applications.

This part cross-references Spectra Premium CU2796 for the same application.

Common Cooling Problems It Can Address

• Coolant leaks from aging plastic tanks or core seams
• Restricted heat transfer from a worn or damaged radiator core
• Overheating caused by reduced radiator efficiency
• Physical damage to the original radiator assembly
• Cooling system service needs on high-mileage Dodge Sprinter 2500 and Sprinter 3500 models

Installation Notes and Tips

Verify inlet and outlet orientation before installation; this radiator uses a left-side inlet and right-side outlet. Confirm the vehicle’s cooling system condition, inspect hoses and clamps, and flush the system if contamination or debris is present. The cap is not included, so reuse or replace the correct cap separately as needed. Match the radiator to the listed year, make, and model before installation.

Quality Assurance

CSF states that its factories are ISO/TSO certified and that its radiators are engineered and tested for cooling performance validation. The brand has supplied radiators worldwide for more than 50 years and manufactures a broad catalog of OE-style radiator applications.