International Radiator - International Harvester IHC 1003778C, Northern Radiator 238629, Active Radiator Supply Company 6400-90, Reach Cooling 42-10582

When your International 8600 TranStar or ProStar needs a new radiator, Reach Cooling 42-10582 delivers an aftermarket solution engineered to meet or exceed OE specifications. This radiator directly replaces International Harvester IHC 1003778C and cross-references Northern Radiator 238629, Active Radiator Supply Company 640090, 1-800-Radiator 2400914, Serck FLA002234, and NAPA NR4210503. The aluminum core features B-type tubes with central reinforcement for greater pressure tolerance, folded fin edges for improved heat disbursement and stability, and thermal expansion cuts that allow the core to breathe through normal heat cycles, reducing long-term failure rates. Deep extrusion headers create a stronger tube-to-header joint that resists vibration and thermal expansion, virtually eliminating header leaks, while longer header tabs add pressure resistance to prevent tank-to-header leaks. Multi-fit attachments allow broad vehicle coverage without sacrificing a precise OE fit. This radiator covers International 8600 TranStar applications from 2010 through 2018 and International ProStar applications from 2010 through 2018 across multiple engine displacements. If you are sourcing by OEM number or looking for a confirmed cross to IHC 1003778C, this Reach Cooling unit is the correct direct replacement for your International truck.