The small auxiliary radiator on a 2020-up HD truck leaks or clogs while the big primary still holds coolant, and the cooling stack never works as a pair. Replace that auxiliary unit with the CSF 3938. It is a 1-row radiator, not the primary core.

• Build: One row, 5/8 inch thick, with a 37-5/8 inch core width, crossflow, so it only fills the auxiliary opening.
• No transmission cooler: No transmission oil cooler is in this radiator.
• Part number: CSF 3938 crosses OEM 84098260.
• Fitment: 2020-2026 Chevrolet Silverado 2500 and 3500 and GMC Sierra 2500 and 3500 auxiliary radiator.
• Does not fit: The primary radiator, CSF 3928, or any 2019-older HD truck.
• 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 the failed part is the auxiliary radiator on a 2020-2026 2500HD or 3500HD before you order.