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CSF 3951 Radiator
CSF 3951 Radiator for Honda and Acura
CSF 3951 is an OE-style radiator built with an aluminum core and plastic tanks for direct replacement service on select Honda and Acura applications. It features an upgraded heavy-duty core that is 7% thicker than the OEM 27 mm design, with fitment for the 2022-2025 Honda Civic, 2023-2025 Honda Accord, and 2023-2025 Acura Integra.
Key Features
- Aluminum core with plastic tank construction
- Down-flow radiator design
- 1-row core layout
- Core thickness: 1 3/16 in.
- Core width: 29 11/16 in.
- Core length: 15 3/4 in.
- Inlet and outlet diameter: 1 1/4 in. left
- Upgraded heavy-duty core, 30 mm vs. OEM 27 mm
- Wind tunnel tested for cooling performance validation
- Manufactured by CSF, an ISO/TSO certified supplier with broad OE-style radiator coverage
Detailed Description
CSF part number 3951 is engineered as a direct-fit radiator for late-model Honda and Acura vehicles, including the Honda Civic, Honda Accord, and Acura Integra. The radiator uses an aluminum core paired with plastic tanks in an OE-style configuration, while the thicker 30 mm heavy-duty core adds capacity over the factory 27 mm design. With a down-flow layout, single-row core, and left-side 1 1/4 in. inlet and outlet connections, this radiator is built around the dimensions and connection points needed for proper replacement fitment.
CSF manufactures a wide range of radiators for leading vehicle brands and validates cooling performance through laboratory wind tunnel testing. Part number 3951 is a practical choice when replacing a worn or leaking radiator on a 2022-2025 Honda Civic, 2023-2025 Honda Accord, or 2023-2025 Acura Integra. This part cross-references TechPro HO3010256 for the same application.
Common Problems This Radiator Can Address
- Coolant leaks from a damaged or corroded radiator
- Overheating caused by reduced heat transfer efficiency
- Cracked plastic tank failure on aging factory units
- Restricted cooling performance from a weakened core
- Replacement needs after impact or front-end damage
Installation Notes and Tips
Verify radiator dimensions, inlet and outlet orientation, and vehicle application before installation. This radiator does not include a radiator cap. Transfer or replace related cooling system components as needed, and refill the system with the correct coolant specification for the vehicle. After installation, bleed air from the cooling system and confirm there are no leaks.
Quality Assurance
CSF is an ISO/TSO certified manufacturer with more than 50 years of radiator production experience and a large global catalog of OE-style cooling components. The brand states that its radiators are engineered for performance validation and built to consistent manufacturing standards.
Compatible Vehicles
- Fits 2023-2025 Acura Integra, N/A
- Fits 2023-2025 Honda Accord, N/A
- Fits 2022-2025 Honda Civic, N/A
| Brand | CSF |
| Part Number | 3951 |
| Core Thickness | 1 3/16 |
| Core Width | 29 11/16 |
| Core Material | Aluminum |
| Tank Material | Plastic |
| Core Length | 15 3/4 |
| Inlet Diameter | 1 1/4 left |
| Outlet Diameter | 1 1/4 left |
| Down Flow Or Cross Flow Type | Down flow |
| Box Height (in) | 5 11/16 |
| Box Length (in) | 32 1/4 |
| Box Weight (lbs) | 11 |
| Box Width (in) | 22 3/16 |
| Hazardous Material | No |
| Inlet Length (in) | 30 3/16 |
| Inlet Width (in) | 1 5/8 |
| No. Of Rows | 1 |
| Oil Cooler (in) | No |
| Outlet Length (in) | 30 3/16 |
| Outlet Width (in) | 1 5/8 |
| Radiator Cap Supplied | No |
| Tech Note | O.e.m. style plastic tank & aluminum core. upgraded heavy duty co |
This part fits 10 vehicles. Search below:
| Year | Make | Model | Liters | Cylinders | Fuel Type | Position | Notes |
|---|---|---|---|---|---|---|---|
| 2025 | Acura | Integra | 1.5L | L4 | N/A | Upgraded Heavy Duty Core. 7% Thicker 30mm vs OEM 27mm | |
| 2025 | Honda | Accord | 1.5L | L4 | N/A | Upgraded Heavy Duty Core. 7% Thicker 30mm vs OEM 27mm | |
| 2025 | Honda | Civic | 2.0L | L4 | GAS | N/A | Upgraded Heavy Duty Core. 7% Thicker 30mm vs OEM 27mm |
| 2024 | Acura | Integra | 1.5L | L4 | N/A | Upgraded Heavy Duty Core. 7% Thicker 30mm vs OEM 27mm | |
| 2024 | Honda | Accord | 1.5L | L4 | N/A | Upgraded Heavy Duty Core. 7% Thicker 30mm vs OEM 27mm | |
| 2024 | Honda | Civic | 1.5L | L4 | N/A | Upgraded Heavy Duty Core. 7% Thicker 30mm vs OEM 27mm | |
| 2023 | Acura | Integra | 1.5L | L4 | N/A | Upgraded Heavy Duty Core. 7% Thicker 30mm vs OEM 27mm | |
| 2023 | Honda | Accord | 2.0L | L4 | FULL HYBRID EV-GAS (FHEV) | N/A | Upgraded Heavy Duty Core. 7% Thicker 30mm vs OEM 27mm |
| 2023 | Honda | Civic | 2.0L | L4 | N/A | Upgraded Heavy Duty Core. 7% Thicker 30mm vs OEM 27mm | |
| 2022 | Honda | Civic | 2.0L | 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.