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CSF 3901 Radiator
| Brand | CSF 3901 |
|---|---|
| Core Thickness | 7/8 |
| Core Width | 19 3/16 |
| Core Material | Aluminum |
| Tank Material | Plastic |
| Core Length | 34 15/16 |
| Inlet Diameter | 1 5/16 left |
| Outlet Diameter | 1 9/16 right |
| Down Flow Or Cross Flow Type | Cross flow |
| Radiator Core Row Quantity | 1 |
| Cap Included | No |
| Box Height (in) | 6 1/4 |
| Box Length (in) | 44 7/16 |
| Box Weight (lbs) | 18 |
| Box Width (in) | 25 1/8 |
| Hazardous Material | No |
| Inlet Length (in) | 19- 15/16 |
| Inlet Width (in) | 1 9/16 |
| Oil Cooler (in) | 11 1/2 left & right (high-effeciency plate type) |
| Outlet Length (in) | 19 15/16 |
| Outlet Width (in) | 2 7/16 |
| Tech Note | O.e.m. style plastic tanks & aluminum core with quick-connect oil |
| Fits | Chevrolet and GMC · 6 vehicles |
OE-style construction. Plastic tanks and an aluminum core match the original design.
Cross-flow design. Helps promote efficient coolant flow through the radiator.
Quick-connect fittings. Makes oil cooler connections faster and cleaner to install.
Cross-references OSC 13841, 23388805 and GM3010619 for the same application. See all 3.
Will it fit your vehicle?
Free return shipping if it doesn't fit.
CSF 3901 Radiator for Silverado and Sierra
The CSF 3901 radiator is built for 2019-2021 Chevrolet Silverado 1500 and GMC Sierra 1500 applications with OE-style plastic tanks and an aluminum core. It is engineered for direct replacement fitment and consistent cooling performance in cross-flow configurations.
Key Features
- Aluminum core with plastic tanks for OE-style construction
- Cross-flow design with 1-row core layout
- Core thickness: 7/8 in.
- Core dimensions: 19 3/16 in. wide x 34 15/16 in. long
- Inlet diameter: 1 5/16 in. left
- Outlet diameter: 1 9/16 in. right
- Quick-connect oil cooler fittings with high-efficiency plate-type oil cooler
- Designed and wind tunnel tested for cooling performance validation
- Part number: 3901
Detailed Description
CSF 3901 is a radiator assembly for the Chevrolet Silverado 1500 and GMC Sierra 1500, covering 2019-2021 model years listed in the fitment data. It uses an aluminum core with OEM-style plastic tanks and quick-connect oil cooler fittings, matching the layout expected in modern truck cooling systems. The cross-flow design and plate-type oil cooler support stable heat transfer in demanding driving conditions. CSF manufactures radiators to high-performance standards and validates designs through laboratory wind tunnel testing. Part number 3901 also cross-references OSC 13841 for the same application.
What This Radiator Helps Address
- Overheating caused by a leaking or restricted radiator
- Coolant loss from cracked plastic tanks or aged seams
- Poor heat rejection from a clogged or damaged core
- Transmission or engine cooling concerns tied to radiator failure
- Fitment issues when replacing an OE-style radiator on Silverado 1500 or Sierra 1500 trucks
Installation Notes and Tips
Verify inlet and outlet orientation before installation: inlet is left and outlet is right. Confirm the vehicle uses the listed OE-style radiator layout and quick-connect oil cooler fittings before removal of the original unit. Inspect hoses, clamps, and cooler connections for wear during replacement to help prevent repeat leaks. Fits 2019-2020 Chevrolet Silverado 1500, N/A. Fits 2021 Chevrolet Silverado 1500, N/A. Fits 2019-2020 GMC Sierra 1500, N/A. Fits 2021 GMC Sierra 1500, N/A.
Quality Assurance
CSF radiators are manufactured in ISO/TSO-certified facilities and built to established performance standards. The brand has supplied radiators worldwide for decades and produces a broad range of cooling components for major vehicle platforms.
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2021 | Chevrolet | Silverado 1500 | 4.3L | V6 | N/A | — |
| 2021 | GMC | Sierra 1500 | 4.3L | V6 | N/A | — |
| 2020 | Chevrolet | Silverado 1500 | 4.3L | V6 | N/A | OE style design ensures optimal fitment and performance. |
| 2020 | GMC | Sierra 1500 | 4.3L | V6 | N/A | OE style design ensures optimal fitment and performance. |
| 2019 | Chevrolet | Silverado 1500 | 4.3L | V6 | N/A | OE style design ensures optimal fitment and performance. |
| 2019 | GMC | Sierra 1500 | 4.3L | V6 | N/A | OE style design ensures optimal fitment and performance. |
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