One Stop Solutions 2694 Radiator

Radiator for Mazda RX-8 Cooling Service

This One Stop Solutions radiator, part number 2694, is built for 2004-2008 Mazda RX-8 applications with a downflow layout and integrated transmission oil cooler. It is engineered around OE form and function for a direct replacement on the RX-8 cooling system.

Key Features

• Fits 2004-2008 Mazda RX-8, N/A
• Premium aluminum radiator construction with plastic tanks
• Downflow design with one-row core
• Transmission oil cooler included; engine oil cooler not included
• Core dimensions: 14 3/16 in. height, 25 1/2 in. width, 1 in. thickness
• Inlet and outlet diameters: 1 3/8 in.
• Pressure tested during production for leak verification
• Factory-style fitment with OE-style cooling performance

Detailed Description

One Stop Solutions 2694 is a replacement radiator engineered for the Mazda RX-8 cooling system. It uses premium-grade aluminum construction with plastic tanks and a plated transmission oil cooler, while maintaining OE-style dimensions and mounting layout for a direct replacement. The core measures 14 3/16 inches tall by 25 1/2 inches wide and 1 inch thick, with 1 3/8-inch inlet and outlet connections.

This radiator is built with design updates aimed at improving durability and cooling consistency in higher-mileage vehicles. The unit is individually pressure tested, and the transmission and engine oil cooler circuits are checked during production stages before final assembly testing. Part number 2694 is a practical choice for Mazda RX-8 owners replacing a worn or leaking radiator while keeping the original cooling configuration intact.

This part cross-references Spectra Premium CU2694 for the same application.

Common Problems This Radiator Can Address

• Coolant leaks from a cracked or aging radiator tank
• Overheating caused by restricted or damaged radiator flow
• Transmission fluid cooling issues related to a failing integrated cooler
• Reduced cooling efficiency from worn internal tubes or fins
• Fitment problems caused by a non-OE-style replacement radiator

Installation Notes and Tips

Verify core dimensions, inlet and outlet size, and cooler configuration before installation. This radiator is a downflow design and includes an integrated transmission oil cooler, so confirm the vehicle’s original setup matches these specifications. Use factory mounting points and follow OE torque procedures for a secure installation.

Quality Assurance

OSC radiators are produced with OE-style engineering, pressure testing, and production checks on the cooler circuits and assembled unit. The design focuses on factory fit, leak resistance, and long-term cooling performance for Mazda RX-8 service replacement needs.