CSF 3963 Radiator

CSF 3963 Radiator for Honda CR-V

The CSF 3963 is an OE-style radiator built with an aluminum core and plastic tanks for the 2023-2026 Honda CR-V. It features an upgraded heavy-duty core that is 11% thicker than the OEM 27mm design, helping support cooling performance in a direct-fit replacement format.

Key Features

• Fits 2023-2026 Honda CR-V, N/A
• OE-style plastic tank and aluminum core construction
• Upgraded heavy-duty core: 30mm thickness versus OEM 27mm
• Down-flow radiator design
• Single-row core layout
• Inlet and outlet diameter: 1 1/4 in. left
• Core dimensions: 29 11/16 in. wide x 16 3/4 in. long x 1 3/16 in. thick
• CSF part number 3963

Product Details

CSF part number 3963 is engineered for the 2023-2026 Honda CR-V and built to match the OE-style radiator layout with plastic tanks and an aluminum core. CSF manufactures radiators to high-performance standards and validates cooling performance through laboratory wind-tunnel testing. This radiator uses a thicker 30mm heavy-duty core, which is 11% thicker than the OEM 27mm specification, while maintaining the factory-style down-flow configuration.

This part cross-references BBB Industries 13946 for the same application.

Common Cooling Issues Addressed

• Cracked or leaking radiator tanks
• Restricted coolant flow from an aging core
• Cooling system wear on high-mileage Honda CR-V models
• Replacement needs after corrosion or physical damage
• Restoring factory-style cooling system fitment

Installation Notes and Tips

Verify inlet and outlet orientation before installation, as this radiator uses left-side 1 1/4 in. connections. Confirm all hose, mount, and fan-shroud interfaces against the original unit before final assembly. Radiator cap is not supplied.

Quality Assurance

CSF radiators are manufactured in ISO/TSO-certified facilities and are engineered for cooling performance validation. The brand has supplied radiators worldwide for more than 50 years and has produced over 30 million units across more than 10,000 models.