Western Star Radiator - Western Star 526876001, Active Radiator Supply Company 800120, 1-800-Radiator 2401239, Reach Cooling 42-10475

Keep your Western Star 4900 Series running cool with the Reach Cooling 42-10475 aftermarket radiator, a confirmed direct replacement for Western Star 526876001. This down-flow unit also cross-references Active Radiator Supply Company 800120, 1-800-Radiator 2401239, Serck FLA001511, NAPA NR4210475, and OSC HD9336, making it straightforward to verify the correct fit before you order. Designed to cover the Western Star 4900EX, 4900FA, and 4900SA from 2008 through 2015 across a broad range of engine displacements, this radiator is built to meet or exceed original equipment specifications. The aluminum core uses B-type tubes with central reinforcement for greater pressure tolerance and drastically reduced tube failure risk, while the deep extrusion header creates a stronger tube-to-header joint that resists vibration and thermal expansion. Folded fin edges improve heat disbursement, and thermal expansion cuts allow the core to breathe through normal heat cycles, extending service life. Longer header tabs resist tank-to-header leaks, and multi-fit attachments let one unit cover multiple 4900 Series configurations without sacrificing OE fit. If you are replacing a failed or leaking radiator on a Western Star 4900EX, 4900FA, or 4900SA, the Reach Cooling 42-10475 is the direct, drop-in solution.