One Stop Solutions 2331 Radiator

Radiator for Subaru Baja, Legacy, and Outback

One Stop Solutions 2331 is a direct-fit radiator built for select Subaru applications with downflow cooling and an integrated transmission oil cooler. It is engineered around OES form and function, with a plastic tank design and premium aluminum core construction for consistent heat transfer and factory-style fitment.

• Fits 2003-2006 Subaru Baja, N/A
• Fits 2000-2004 Subaru Legacy, N/A
• Fits 2000-2004 Subaru Outback, N/A
• Downflow radiator design with 1-row core
• Transmission oil cooler included; engine oil cooler not included
• Core dimensions: 13 3/8 in. height, 27 3/16 in. width, 5/8 in. thickness
• Inlet and outlet diameters: 1 9/16 in.
• Concentric transmission cooler with 1 in. diameter and 14 3/4 in. fitting spacing
• Part number 2331

Built for OE-Style Cooling Performance

This radiator is designed for Subaru Baja, Legacy, and Outback models that use a downflow configuration with a built-in transmission cooler. OSC uses premium-grade tubes, fins, headers, and tanks, along with cadmium-plated tubes inside and out to help resist premature failure. The radiator is individually pressure tested during production and built to factory specifications for fit, form, and function. Part number 2331 also cross-references APDI 8012331 for the same application.

Common Problems This Radiator Can Address

• Leaking or cracked radiator tanks
• Restricted coolant flow from an aging core
• Transmission fluid temperature concerns tied to a failing cooler
• Overheating caused by worn fins, tubes, or headers
• Fitment issues from a damaged or non-OE-style replacement radiator

Installation Notes and Tips

Verify the vehicle’s cooling system layout before installation, especially the downflow configuration and transmission cooler connection points. Compare inlet and outlet sizes, cooler spacing, and core dimensions against the original unit to confirm a proper match. Because this radiator is built for factory-style installation, it is suited for direct replacement on 2000-2004 Subaru Legacy, 2000-2004 Subaru Outback, and 2003-2006 Subaru Baja applications.

Quality Assurance

OSC tests the radiator core before assembly, then tests the transmission and engine oil cooler circuits prior to tank installation, and performs a final pressure test after assembly. The design also incorporates enhancements aimed at addressing original failure points in higher-mileage vehicles, including increased fin density and a thicker core where applicable. Part number 2331 is built to meet OE-style cooler design requirements for the listed Subaru applications.