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CSF 3870 Radiator
| Brand | CSF 3870 |
|---|---|
| Core Thickness | 1 1/4 |
| Core Width | 11 5/16 |
| Core Material | Aluminum |
| Tank Material | Plastic |
| Core Length | 25 9/16 |
| Inlet Diameter | 1 3/8 left |
| Outlet Diameter | 1 3/8 right |
| Down Flow Or Cross Flow Type | Cross flow |
| Radiator Core Row Quantity | 1 |
| Cap Included | No |
| Box Height (in) | 6 5/8 |
| Box Length (in) | 33 5/8 |
| Box Weight (lbs) | 9 |
| Box Width (in) | 19 13/16 |
| Hazardous Material | No |
| Inlet Length (in) | 11 15/16 |
| Inlet Width (in) | 1 9/16 |
| Oil Cooler (in) | No |
| Outlet Length (in) | 11 15/16 |
| Outlet Width (in) | 1 9/16 |
| Tech Note | O.e.m. style plastic tank & aluminum core. |
| Fits | Hyundai and Kia · 17 vehicles |
OE-style design. Plastic tank and aluminum core construction matches the original layout.
Cross-flow radiator. Engineered for efficient coolant flow and cooling performance validation.
ISO/TSO certified. Built in certified factories and supplied worldwide for decades.
Cross-references Bosch 13710, 25310F3300 and 25310M6400 for the same application. See all 5.
OE-Style Cooling for Select Hyundai and Kia Models
CSF 3870 is an OE-style radiator built with an aluminum core and plastic tanks for direct replacement cooling performance. It is engineered for select Hyundai Elantra, Hyundai Elantra GT, and Kia Forte applications, including the 2022-2024 Kia Forte with an upgraded heavy-duty core.
Key Features
- Aluminum core with plastic tank construction
- Cross-flow radiator design
- 1-row core layout
- Core thickness: 1 1/4 in.
- Inlet diameter: 1 3/8 in. left
- Outlet diameter: 1 3/8 in. right
- OE-style plastic tank and aluminum core design
- CSF part number 3870
Detailed Description
CSF 3870 is designed as a direct-fit radiator for vehicles that need dependable engine cooling and OE-style packaging. The aluminum core helps transfer heat efficiently, while the plastic tank construction follows the original equipment layout for fitment consistency. This radiator is a cross-flow design with a single core row, and its 1 1/4-inch core thickness supports the heavy-duty cooling profile used on select applications. CSF part number 3870 is listed for 2022-2024 Kia Forte, 2019-2021 Kia Forte, 2017-2020 Hyundai Elantra, and 2018-2020 Hyundai Elantra GT. This part cross-references Bosch 13710 for the same application.
Vehicle Fitment
- Fits 2022-2024 Kia Forte, N/A. Upgraded Heavy Duty Core. 19% Thicker 30mm vs OEM 25mm
- Fits 2019-2021 Kia Forte, N/A. OE style design ensures optimal fitment and performance.
- Fits 2017-2020 Hyundai Elantra, N/A. OE style design ensures optimal fitment and performance.
- Fits 2018-2020 Hyundai Elantra GT, N/A. OE style design ensures optimal fitment and performance.
Installation Notes and Tips
- Verify inlet and outlet orientation before installation; this unit uses left inlet and right outlet placement.
- Confirm radiator dimensions and mounting layout against the original unit before removal.
- Inspect hoses, clamps, and coolant condition during replacement to help avoid repeat cooling-system issues.
- Use the correct coolant specification for the vehicle platform after installation.
Quality Assurance
CSF manufactures radiators to high-performance standards and validates cooling performance through laboratory wind-tunnel testing. The brand has produced radiators for more than 50 years and supplies a wide range of applications across the automotive market.
| Year | Make | Model | Body Type | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|---|
| 2024 | Kia | Forte | Sedan | 1.6L | L4 | N/A | Upgraded Heavy Duty Core. 19% Thicker 30mm vs OEM 25mm |
| 2023 | Kia | Forte | Sedan | 1.6L | L4 | N/A | Upgraded Heavy Duty Core. 19% Thicker 30mm vs OEM 25mm |
| 2022 | Kia | Forte | Sedan | 1.6L | L4 | N/A | Upgraded Heavy Duty Core. 19% Thicker 30mm vs OEM 25mm |
| 2021 | Kia | Forte | — | 1.6L | L4 | N/A | OE style design ensures optimal fitment and performance. |
| 2020 | Hyundai | Elantra | — | 1.6L | L4 | N/A | OE style design ensures optimal fitment and performance. |
| 2020 | Hyundai | Elantra | — | 1.4L | L4 | N/A | OE style design ensures optimal fitment and performance. |
| 2020 | Hyundai | Elantra GT | — | 1.6L | L4 | N/A | OE style design ensures optimal fitment and performance. |
| 2020 | Kia | Forte | — | 1.6L | L4 | N/A | OE style design ensures optimal fitment and performance. |
| 2019 | Hyundai | Elantra | — | 1.4L | L4 | N/A | OE style design ensures optimal fitment and performance. |
| 2019 | Hyundai | Elantra | — | 1.6L | L4 | N/A | OE style design ensures optimal fitment and performance. |
| 2019 | Hyundai | Elantra GT | — | 1.6L | L4 | N/A | OE style design ensures optimal fitment and performance. |
| 2019 | Kia | Forte | — | 1.6L | L4 | N/A | OE style design ensures optimal fitment and performance. |
| 2018 | Hyundai | Elantra | — | 1.4L | L4 | N/A | OE style design ensures optimal fitment and performance. |
| 2018 | Hyundai | Elantra | — | 1.6L | L4 | N/A | OE style design ensures optimal fitment and performance. |
| 2018 | Hyundai | Elantra GT | — | 1.6L | L4 | N/A | OE style design ensures optimal fitment and performance. |
| 2017 | Hyundai | Elantra | — | 1.4L | L4 | N/A | OE style design ensures optimal fitment and performance. |
| 2017 | Hyundai | Elantra | — | 1.6L | L4 | N/A | OE style design ensures optimal fitment and performance. |
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