CSF 3955 Radiator

OE-Style Radiator for Encore GX and Trailblazer

CSF 3955 is a cross flow radiator built with an aluminum core and plastic tanks in an OE-style layout. It is engineered for 2020-2026 Buick Encore GX and 2021-2026 Chevrolet Trailblazer applications, with an upgraded heavy-duty core that is 10% thicker than the OEM 20 mm design.

Key Features

• Aluminum core with plastic tank construction
• Cross flow design for the listed GM applications
• Upgraded heavy-duty core thickness: 22 mm versus OEM 20 mm
• Quick-connect outlet pipe design
• Single-row core configuration
• Inlet: 1 5/16 in. left; outlet: 1 1/2 in. right
• CSF part number 3955

Detailed Description

CSF 3955 is a replacement radiator engineered for direct-fit service on the Buick Encore GX and Chevrolet Trailblazer. It uses an OE-style plastic tank and aluminum core construction, with a cross flow layout and a quick-connect outlet pipe to match the factory-style cooling system design. CSF states that its radiators are manufactured to high-performance standards, wind tunnel tested for cooling validation, and produced in ISO/TSO-certified facilities. This part cross-references Dorman - HELP 13909 for the same application.

What This Radiator Helps Address

• Cooling system leaks from a damaged or aging radiator
• Restricted coolant flow caused by internal core deterioration
• Overheating concerns related to reduced heat transfer
• Replacement needs after impact damage or tank failure
• Service replacement for a worn OE-style radiator assembly

Installation Notes and Tips

Verify inlet and outlet orientation before installation: inlet is 1 5/16 in. on the left and outlet is 1 1/2 in. on the right. Confirm the vehicle uses the listed cross flow configuration and quick-connect outlet pipe arrangement. This radiator does not include a radiator cap. For fitment, use CSF 3955 on 2020-2026 Buick Encore GX and 2021-2026 Chevrolet Trailblazer, with the upgraded heavy-duty core specification noted for both applications.

Quality Assurance

CSF has supplied radiators worldwide for more than 50 years and reports over 30 million units sold. The brand also notes ISO/TSO-certified manufacturing and laboratory wind tunnel testing for cooling performance validation. Part number 3955 is built to support the listed GM fitments with an OE-style construction and upgraded core thickness.