Freightliner, Sterling Truck, Kenworth Radiator - Freightliner S6504, Northern Radiator 239341, Active Radiator Supply Company 8000-03, Reach Cooling 42-10079

When your Freightliner, Kenworth, or Sterling Truck needs a radiator, the Reach Cooling 42-10079 is the aftermarket direct replacement built to get the job done right. It directly replaces Freightliner 1343568 and cross-references Northern Radiator 239320, Active Radiator Supply Company 6500-04, Serck FLX000305, Keystone Auto Industries HDC010221, and Paccar Parts RAD42-10079TRP. The aluminum core and plastic tank construction meets or exceeds OE specifications, and Reach Cooling backs that up with real engineering details: B-type tubes with central reinforcement resist pressure and reduce tube failure, deep extrusion headers strengthen the tube-to-header joint against vibration and thermal cycling, 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. This radiator fits a wide range of applications including Freightliner Century Class, FL106, FL112, FL70, FL80, FLD112, FLD120, and M2 106; Kenworth T300; and Sterling Truck L7500, L8500, LT7500, and LT8500. Whether you are sourcing by OEM number or by application, Reach Cooling 42-10079 delivers the correct fit and dependable cooling performance your fleet expects.