One Stop Solutions 2636 Radiator

BMW E46 and Z4 Radiator Replacement

Restore cooling performance with this OSC Premium new automotive radiator, part number 2636. It is built for direct replacement use on select BMW 323i, 325i, 330i, 328i, and Z4 applications, with OE-style form and function for a clean install and proper fit.

Key Features

• Premium-grade aluminum radiator construction with plastic tanks
• Crossflow design with a single-row core
• Core dimensions: 22 13/16 in. height, 17 5/8 in. width, 1-1/4 in. thickness
• 1 1/2 in. inlet and outlet diameters
• Engineered for O.E. performance and consistent cooling output
• Die-cut gasket design for leak resistance
• Pressure tested during production for quality control
• Drop-in fit for select BMW E46 and Z4 models

Detailed Description

OSC part 2636 is a replacement radiator designed around original equipment dimensions and cooling requirements. The radiator uses premium aluminum tubes and fins with plastic tanks, and the crossflow layout supports efficient heat transfer in the engine cooling system. OSC also applies engineering updates to address common failure points, including improved fin density and thicker core construction where needed for higher-mileage use.

This radiator is a direct-fit option for select BMW 323Ci, 323i, 323is, 328Ci, 328i, 320i, 325Ci, 325i, 325xi, 330Ci, 330i, 330xi, and Z4 models. It cross-references Spectra Premium CU2636 and Koyorad A2636 for the same application. If you are replacing a BMW E46 radiator or a 2003-2008 BMW Z4 radiator, part 2636 is built to match the original layout without changing the vehicle’s cooling system design.

Common Problems This Radiator Can Address

• Coolant leaks from an aging or cracked radiator tank
• Overheating caused by restricted or weakened radiator flow
• Cooling loss from worn core fins or internal deterioration
• Fitment issues from damaged original mounting points or headers
• Reduced cooling efficiency in high-mileage BMW E46 and Z4 vehicles

Installation Notes and Tips

Verify inlet and outlet hose sizes, core dimensions, and transmission cooler configuration before installation. This radiator does not include an engine oil cooler, transmission oil cooler, or cap. For best results, inspect hoses, clamps, and surrounding cooling components during replacement, and confirm the system is properly filled and bled after installation.

Quality Assurance

OSC radiators are individually pressure tested during production, with the core and cooler circuits checked before and after assembly. The design uses fitted components assembled to factory specifications, and the construction focuses on durability improvements for long-term service in select BMW applications.