International Radiator - International Harvester IHC 1659054C91, Northern Radiator SCSI238505, Spectra Premium SPI20063501, Reach Cooling 42-10624

When your International 3800, 4700, 4900, or related medium-duty truck needs a new radiator, the Reach Cooling 42-10624 is the aftermarket answer. This copper-core, brass-tank downflow radiator is a direct replacement for International Harvester IHC 1659054-C91 and cross-references Northern Radiator 238505, Active Radiator Supply Company 640055PH, Spectra Premium 2006-3501A, NAPA 2006-3501, and Serck FLX000732. Built to meet or exceed OEM specifications, it covers International 3600, 3800, 4600, 4700, 4700LP, 4900, and 7100 models from 1990 through 1997 across a wide range of engine displacements. The three-row core measures 31 inches tall by 26 inches wide, with a 2.5-inch inlet at the top center and a 2.5-inch outlet at the bottom right. A transmission oil cooler is integrated into the design, with 18 inches between fittings, so you are not sourcing a separate cooler. Reach Cooling engineers its radiators with reinforced B-type tubes, deep extrusion headers, and thermal expansion cuts that resist vibration and heat-cycle fatigue - the kind of durability that matters in daily service. If you are searching by the OEM number 1659054-C91 or any of the listed interchanges, this is the correct, direct-fit replacement for your International truck.