Western Star Radiator - Western Star 3S0580730003, Northern Radiator 238767, Active Radiator Supply Company 800124, Reach Cooling 42-10478

When your Western Star 4900EX, 4900FA, or 4900SA needs a new radiator, the Reach Cooling 42-10478 delivers a correct-fit aftermarket replacement built to meet or exceed original equipment specifications. This unit directly replaces Western Star 3A0580730003 and cross-references Northern Radiator 238767, Active Radiator Supply Company 800124, 1-800-Radiator 2401224, Serck FLA001514, and NAPA NR4210478, covering model years from 2008 through 2018 across a wide range of engine displacements. The aluminum core measures 39 inches tall, 41.625 inches wide, and 2.25 inches thick, with a down-flow design, a 2.5-inch top-right inlet, and a 2.5-inch bottom-left outlet. A transmission oil cooler with 12-inch fitting spacing is built in. Construction highlights include B-type tubes with central reinforcement for pressure tolerance, deep extrusion headers that resist tube-to-header leaks, folded fin edges for improved heat dissipation and stability, and thermal expansion cuts that allow the core to flex through normal heat cycles without cracking. Multi-fit attachments are included to simplify installation across compatible applications. If you are sourcing by OEM number or cross-reference, Reach Cooling 42-10478 is the aftermarket answer to Western Star 3A0580730003, engineered to drop in and perform from day one.