Freightliner Radiator - Freightliner 1040293AS, Northern Radiator 238619, Active Radiator Supply Company 3100-81, Reach Cooling 42-10449

When your Freightliner B2, S2, or S2C needs a radiator, the Reach Cooling 42-10449 is the aftermarket direct replacement built to OE standards. This unit replaces Freightliner 1003748A and cross-references Northern Radiator 238619, Active Radiator Supply Company 3100-81, Serck FLA001030, NAPA NR4210449, and OSC HD9256, making it straightforward to verify the right fit against your existing part number. The aluminum core uses B-type tubes with central reinforcement to handle pressure spikes and reduce tube failure, while deep extrusion headers lock in a stronger tube-to-header joint that resists the constant vibration and thermal cycling that heavy-duty applications demand. Folded fin edges improve stability and heat disbursement, and thermal expansion cuts allow the core to breathe through normal heat cycles, extending service life. A transmission oil cooler with an 18-inch fitting distance is built in, keeping drivetrain temperatures in check without adding extra plumbing. The downflow design features a top-left inlet and bottom-right outlet, both at 2 inches, with a core measuring 29.75 inches tall by 25.125 inches wide. Fits Freightliner B2 (2008-2013), S2 (2007-2011), and S2C (2013) with 6.4L, 6.7L, and 7.2L engines. If you are sourcing by Freightliner 1003748A or any of the listed cross-references, the Reach Cooling 42-10449 is the correct-fit drop-in replacement.