GMC, Chevrolet Radiator - Northern Radiator 239015, Active Radiator Supply Company 5800-42, 1-800-Radiator 2400405, Reach Cooling 42-10425

When your GMC or Chevrolet medium-duty truck needs a radiator, the Reach Cooling 42-10425 delivers an aftermarket replacement built to meet or exceed OE specifications for the Kodiak and Topkick series. This down-flow aluminum core radiator directly replaces Northern Radiator 239015, Active Radiator Supply Company 580042ST, 1-800-Radiator 2400405, Serck FLA000853, NAPA NR4210425, and Vista Pro 437571S, making it straightforward to confirm the right fit against the number on your old unit. Reinforced B-type tubes with central support reduce the risk of tube failure under pressure, while deep extrusion headers create a stronger tube-to-header joint that resists the effects of vibration and thermal expansion. Folded fin edges improve stability and heat disbursement, and thermal expansion cuts allow the core to breathe through normal heat cycles for longer service life. An integrated engine oil cooler is included. Included multi-fit attachments allow this single part to cover multiple vehicle configurations without sacrificing OE fit. Fitment covers 2003-2007 GMC C4500 Topkick, C5500 Topkick, C6500 Topkick, C7500 Topkick, and C8500 Topkick, along with 2003-2007 Chevrolet C4500 Kodiak, C5500 Kodiak, C6500 Kodiak, C7500 Kodiak, and C8500 with 6.6L and 8.1L engines. Radiator cap, frame, and filler neck are not included. Order with confidence knowing this radiator is purpose-built to fit and perform exactly like the original.