CSF 3946 Radiator

OE-Style Radiator for Ford Cooling Service

This CSF radiator is built for Ford Ranger and Ford Bronco applications that need a direct-fit cooling system replacement with OE-style construction. Part number 3946 uses an aluminum core with plastic tanks and a cross-flow layout to match the factory-style configuration.

Designed for 2021-2025 Ford Bronco and 2024-2026 Ford Ranger applications, CSF 3946 features a heavy-duty core that is 7% thicker than the OEM 27mm design. The quick-connect inlet and outlet pipe layout supports a clean radiator replacement for vehicles using the listed factory-style connections.

Key Features

• CSF part number 3946
• OE-style plastic tank and aluminum core construction
• Cross-flow radiator design
• 1-row core with 1 1/4 in. core thickness
• Heavy-duty core is 30mm thick, 7% thicker than OEM 27mm
• 1 1/2 in. inlet on the right and 1 1/2 in. outlet on the left
• Built for 2021-2025 Ford Bronco and 2024-2026 Ford Ranger
• Wind tunnel tested for cooling performance validation

Detailed Description

CSF 3946 is a replacement radiator engineered for Ford Ranger and Ford Bronco cooling system service where factory-style fitment and thermal performance matter. It uses an aluminum core with plastic tanks, a cross-flow configuration, and quick-connect inlet and outlet pipe connections. The core measures 33 7/16 in. long and 15 5/8 in. wide, with a 1 1/4 in. thickness and a single-row design. CSF states this heavy-duty core is 30mm thick, which is 7% thicker than the OEM 27mm specification.

CSF manufactures radiators to high-performance standards and validates cooling performance in laboratory wind tunnel testing. Part number 3946 cross-references BBB Industries 13936 and Partslink FO3010371 for the same application.

Common Cooling Issues Addressed

• Leaking radiator tanks or core seams
• Restricted coolant flow from an aging radiator
• Overheating caused by reduced heat transfer
• Cracked or brittle plastic end tanks
• Damaged inlet or outlet connections

Installation Notes and Tips

Verify inlet and outlet orientation before installation: inlet is 1 1/2 in. on the right and outlet is 1 1/2 in. on the left. This radiator does not include a radiator cap and does not include an oil cooler. Confirm vehicle-specific fitment for your Ford Bronco or Ford Ranger before removing the original unit, and inspect hoses, clamps, and coolant condition during service.

Quality Assurance

CSF manufactures radiators in ISO/TSO-certified facilities and has supplied cooling components worldwide for more than 50 years. The brand reports more than 30 million radiators sold and uses laboratory testing to validate cooling performance.

• Fits 2021-2025 Ford Bronco, N/A
• Fits 2024-2026 Ford Ranger, N/A