Freightliner, Western Star, Sterling Truck Radiator - Freightliner A0516366004, Spectra Premium 2101-1701A, Active Radiator Supply Company 800021, Reach Cooling 42-10323

When your Freightliner FLD120, FLC112, FLB, Columbia, Classic, FL60, FL70, FL80, M2 106, Western Star 4900, or Sterling Truck A9500 needs a new radiator, the Reach Cooling 42-10323 is the aftermarket direct replacement built for the job. This heavy-duty 4-row copper and brass crossflow radiator is engineered to meet or exceed original equipment specifications and directly replaces Freightliner 1AC00002 - the primary OEM reference for this application. It also cross-references Active Radiator Supply Company 800021, Spectra Premium 2101-1701A, 1-800-Radiator 2400141, Serck FLX000223, and NAPA 21011701, so you can confirm the fit no matter which catalog you are working from. The core features centrally reinforced B-type tubes for greater pressure tolerance, deep extrusion headers for a stronger tube-to-header joint that resists vibration and thermal expansion, folded fin edges for improved heat dissipation, and thermal expansion cuts that extend core life through normal heat cycles. Multi-fit attachments allow this single radiator to cover the broad range of Freightliner, Western Star, and Sterling Truck models it serves without sacrificing OE fit. If Freightliner 1AC00002 is what came out of your truck, Reach Cooling 42-10323 is the proven aftermarket replacement to put back in.