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Thumbnail Filmstrip of 2020-2023 6.6L L5P Duramax OEM Style Primary Radiator CSF 3928 Images
The primary radiator on a 2020-up L5P leaks at the tank or lets the transmission run hot when the built-in cooler is plugged. Replace it with the CSF 3928. This is the 2-row primary with quick-connect coolant and oil fittings, not the small auxiliary radiator.
- Build: Two rows, 30-5/8 inches by 34-1/2 inches and 2-1/16 inches thick, crossflow.
- Transmission cooler: An 11-1/2 inch high-efficiency plate cooler is in the radiator, with quick-connect oil-cooler fittings and a quick-connect outlet pipe.
- Hoses: Inlet is 2 inches on the left and the outlet is 2-1/4 inches on the right.
- Tank: Glass-filled plastic tank and EPDM seals, leak-tested at 150 percent of operating pressure.
- Part number: CSF 3928 crosses OEM 84708306, 84799449, and 85610318.
- Fitment: 2020-2026 Chevrolet Silverado 2500 and 3500 and GMC Sierra 2500 and 3500 primary radiator.
- Does not fit: The auxiliary radiator, CSF 3938, or the 2017-2019 primary, CSF 3843.
- Not in the box: The radiator cap is not included, and the hoses and clamps are not in the box.
- Warranty: CSF lists a 2-year limited warranty for the original owner. The term is on the warranty card in the box.
Order today to secure your replacement. Confirm you are replacing the primary radiator on a 2020-2026 2500HD or 3500HD before you order.
The primary radiator on a 2020-up L5P leaks at the tank or lets the transmission run hot when the built-in cooler is plugged. Replace it with the CSF 3928. This is the 2-row primary with quick-connect coolant and oil fittings, not the small auxiliary radiator.
Build: Two rows, 30-5/8 inches by 34-1/2 inches and 2-1/16 inches thick, crossflow.
Transmission cooler: An 11-1/2 inch high-efficiency plate cooler is in the radiator, with quick-connect oil-cooler fittings and a quick-connect outlet pipe.
Hoses: Inlet is 2 inches on the left and the outlet is 2-1/4 inches on the right.
Tank: Glass-filled plastic tank and EPDM seals, leak-tested at 150 percent of operating pressure.
Part number: CSF 3928 crosses OEM 84708306, 84799449, and 85610318.
Fitment: 2020-2026 Chevrolet Silverado 2500 and 3500 and GMC Sierra 2500 and 3500 primary radiator.
Does not fit: The auxiliary radiator, CSF 3938, or the 2017-2019 primary, CSF 3843.
Not in the box: The radiator cap is not included, and the hoses and clamps are not in the box.
Warranty: CSF lists a 2-year limited warranty for the original owner. The term is on the warranty card in the box.
Order today to secure your[...]
The primary radiator on a 2020-up L5P leaks at the tank or lets the transmission run hot when the built-in cooler is plugged. Replace it with the CSF 3928. This is the 2-row primary with quick-connect coolant and oil fittings, not the small auxiliary radiator.
- Build: Two rows, 30-5/8 inches by 34-1/2 inches and 2-1/16 inches thick, crossflow.
- Transmission cooler: An 11-1/2 inch high-efficiency plate cooler is in the radiator, with quick-connect oil-cooler fittings and a quick-connect outlet pipe.
- Hoses: Inlet is 2 inches on the left and the outlet is 2-1/4 inches on the right.
- Tank: Glass-filled plastic tank and EPDM seals, leak-tested at 150 percent of operating pressure.
- Part number: CSF 3928 crosses OEM 84708306, 84799449, and 85610318.
- Fitment: 2020-2026 Chevrolet Silverado 2500 and 3500 and GMC Sierra 2500 and 3500 primary radiator.
- Does not fit: The auxiliary radiator, CSF 3938, or the 2017-2019 primary, CSF 3843.
- Not in the box: The radiator cap is not included, and the hoses and clamps are not in the box.
- Warranty: CSF lists a 2-year limited warranty for the original owner. The term is on the warranty card in the box.
Order today to secure your replacement. Confirm you are replacing the primary radiator on a 2020-2026 2500HD or 3500HD before you order.