One Stop Solutions 2635 Radiator

BMW Radiator Replacement for OE-Style Cooling

Restore cooling performance with this OSC Premium New Automotive Radiator, part number 2635. It is built for direct replacement use on select BMW applications, including BMW Z4 and BMW 3 Series models, with OE form and function in mind.

• Premium-grade aluminum construction with plastic tanks
• Crossflow radiator design
• Core height: 22 13/16 in.
• Core width: 17 5/8 in.
• Core thickness: 1-1/4 in. (32 mm)
• Inlet and outlet diameter: 1 1/2 in.
• Single-row core design
• No engine oil cooler, transmission oil cooler, or cap included
• Direct-fit layout for hassle-free installation

Detailed Product Overview

OSC part number 2635 is engineered to match OE-style form and function while using upgraded materials and manufacturing controls. The radiator uses premium aluminum tubes and a die-cut gasket to help maintain a secure seal, while the tank and core layout are built for a drop-in fit. Each unit is individually pressure tested during production, and the design includes enhancements aimed at improving cooling performance and service life in higher-mileage vehicles. This radiator is a direct replacement for select BMW 323Ci, 323i, 323is, 328Ci, 328i, 320i, 325Ci, 325i, 325xi, 330Ci, 330i, 330xi, and Z4 applications.

This part cross-references Gates 51577 and Spectra Premium CU2636 for the same application.

Common Cooling System Issues It May Address

• Coolant leaks from a cracked or aging radiator tank
• Overheating caused by restricted or weakened radiator flow
• Cooling loss from worn seals or deteriorated core components
• Fitment problems when replacing an original BMW radiator
• Reduced cooling efficiency in high-mileage BMW 3 Series and Z4 vehicles

Installation Notes and Fitment

Compatible With 2003-2008 BMW Z4, N/A; 2001-2005 BMW 320i, N/A; 2001-2005 BMW 325Ci, N/A; 2001-2005 BMW 325i, N/A; 2001-2005 BMW 325xi, N/A; 2001-2005 BMW 330Ci, N/A; 2001-2005 BMW 330i, N/A; 2001-2005 BMW 330xi, N/A; 2000 BMW 323Ci, N/A; 1999-2000 BMW 323i, N/A; 2000 BMW 328Ci, N/A; 2000 BMW 328i, N/A; 1998-1999 BMW 323is, N/A.

Verify inlet and outlet sizing, core dimensions, and cooler configuration before installation. This radiator does not include an engine oil cooler, transmission oil cooler, or cap. All necessary fittings or hardware are included in each unit.

Quality Assurance

OSC radiators are produced with OE-style engineering controls and are tested multiple times during manufacturing, including cooler testing before tank installation, core testing before assembly, and final assembly testing. The design also incorporates updates to address common original-equipment failure points and improve durability.