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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
| Brand | CSF |
| Part Number | 3946 |
| Core Thickness | 1 1/4 |
| Core Width | 15 5/8 |
| Core Material | Aluminum |
| Tank Material | Plastic |
| Core Length | 33 7/16 |
| Inlet Diameter | 1 1/2 right |
| Outlet Diameter | 1 1/2 left |
| Down Flow Or Cross Flow Type | Cross flow |
| Box Height (in) | 7 7/16 |
| Box Length (in) | 41 7/8 |
| Box Weight (lbs) | 13 |
| Box Width (in) | 19 13/16 |
| Hazardous Material | No |
| Inlet Length (in) | 16 1/16 |
| Inlet Width (in) | 1 9/16 |
| No. Of Rows | 1 |
| Oil Cooler (in) | No |
| Outlet Length (in) | 16 1/16 |
| Outlet Width (in) | 1 9/16 |
| Radiator Cap Supplied | No |
| Tech Note | O.e.m. style plastic tank & aluminum core with quick-connect inle |
This part fits 8 vehicles. Search below:
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2026 | Ford | Ranger | 2.3L | L4 | N/A | Upgraded Heavy Duty Core. 7% Thicker 30mm vs OEM 27mm |
| 2025 | Ford | Bronco | 2.3L | L4 | N/A | Upgraded Heavy Duty Core. 7% Thicker 30mm vs OEM 27mm |
| 2025 | Ford | Ranger | 2.3L | L4 | N/A | Upgraded Heavy Duty Core. 7% Thicker 30mm vs OEM 27mm |
| 2024 | Ford | Bronco | 2.3L | L4 | N/A | Upgraded Heavy Duty Core. 7% Thicker 30mm vs OEM 27mm |
| 2024 | Ford | Ranger | 2.3L | L4 | N/A | Upgraded Heavy Duty Core. 7% Thicker 30mm vs OEM 27mm |
| 2023 | Ford | Bronco | 2.3L | L4 | N/A | Upgraded Heavy Duty Core. 7% Thicker 30mm vs OEM 27mm |
| 2022 | Ford | Bronco | 2.3L | L4 | N/A | Upgraded Heavy Duty Core. 7% Thicker 30mm vs OEM 27mm |
| 2021 | Ford | Bronco | 2.3L | L4 | N/A | Upgraded Heavy Duty Core. 7% Thicker 30mm vs OEM 27mm |
* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
This part directly replaces or is cross-referenced with the following part numbers:
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.