CSF 3944 Radiator

Heavy-Duty Cooling for Ram 2500 and 3500

CSF 3944 is an OE-style radiator built with a plastic tank and aluminum core for 2019-2024 Ram 2500 and Ram 3500 trucks. It uses a 2-row cross-flow design with an upgraded heavy-duty core to improve cooling capacity over the original 1-row layout.

Fits 2019-2024 Ram 2500, N/A. Fits 2019-2024 Ram 3500, N/A.

Key Features

• Part number 3944 radiator for Ram heavy-duty truck applications
• OE-style plastic tank and aluminum core construction
• 2-row cross-flow design for increased cooling surface area
• 17% thicker 42mm core versus OEM 36mm 1-row core
• Left inlet and right outlet configuration
• Core dimensions: 33 3/8 in. length, 20 5/16 in. width, 1 5/8 in. thickness
• Manufactured by CSF, with ISO/TSO-certified factory processes

Detailed Description

CSF 3944 is engineered as a direct-fit radiator for Ram 2500 and Ram 3500 models from 2019 through 2024. The aluminum core and plastic tank design follows an OE-style layout while the upgraded heavy-duty 2-row core adds thickness for improved heat rejection in demanding towing, hauling, and daily driving conditions. This radiator is cross-flow configured with a 1 15/16 in. inlet on the left and a 1 15/16 in. outlet on the right. CSF states its radiators are developed to performance standards and validated through wind-tunnel testing, supporting consistent cooling performance across real-world use. This part cross-references Mopar 68322491AA and BBB Industries 13871 for the same application.

Common Issues This Radiator Can Address

• Overheating under load in Ram 2500 and Ram 3500 trucks
• Reduced cooling efficiency from a worn or clogged factory radiator
• Coolant temperature rise during towing or stop-and-go driving
• Leaks or tank deterioration associated with aging radiator assemblies
• Need for an OE-style replacement with a thicker heavy-duty core

Installation Notes and Tips

Verify radiator dimensions, inlet and outlet orientation, and vehicle application before installation. This radiator does not include a radiator cap. Inspect hoses, clamps, and surrounding cooling-system components during replacement to help ensure proper sealing and airflow. Confirm fitment for 2019-2024 Ram 2500 and 2019-2024 Ram 3500 before ordering.

Quality Assurance

CSF manufactures radiators in ISO/TSO-certified facilities and validates cooling performance during development. The brand has supplied radiators worldwide for more than 50 years and produces a broad range of OE-style and performance cooling components.