One Stop Solutions 1135 Radiator

Radiator for Mazda 323 and Protege

Restore cooling performance with this OSC Premium new automotive radiator, part number 1135. It is built to OE form and function for 1990-1994 Mazda 323 and 1990-1994 Mazda Protege applications, with a downflow design and integrated concentric transmission oil cooler.

Key Features

• Fits 1990-1994 Mazda 323, N/A
• Fits 1990-1994 Mazda Protege, N/A
• Premium-grade aluminum construction with plastic tanks
• Downflow radiator design with one-row core
• Transmission oil cooler included; engine oil cooler not included
• Die-cut gasket design for a tighter seal
• Individually pressure tested during production
• Engineered for OE-style fit, form, and function

Detailed Description

OSC part number 1135 is a replacement radiator designed for Mazda 323 and Mazda Protege models from 1990 through 1994. The core measures 25 1/8 inches wide, 15 3/8 inches high, and 5/8 inch thick, with 1 1/4 inch inlet and outlet diameters. It uses premium aluminum tubes and a plastic tank design, along with cadmium-plated tubes and factory-style fitted components to help resist premature failure and maintain consistent cooling performance.

This radiator includes a concentric transmission oil cooler and is built to match OE cooler design where originally equipped. OSC also uses engineering updates such as added fin density and enhanced core design to address heat load and durability concerns in higher-mileage vehicles. Part number 1135 is a direct-fit cooling replacement for drivers servicing a Mazda 323 radiator or Mazda Protege radiator application.

This part cross-references Spectra Premium CU1135 for the same application.

What It Helps Address

• Overheating caused by a worn or leaking radiator
• Transmission fluid temperature concerns related to a failing cooler circuit
• Coolant loss from cracked tanks, weak seams, or gasket leakage
• Reduced cooling efficiency from aged core passages or damaged fins
• Fitment issues when replacing an OE-style Mazda 323 or Protege radiator

Installation Notes and Tips

Verify inlet and outlet sizes, core dimensions, and cooler line routing before installation. Inspect hoses, clamps, and mounting points for wear, and flush the cooling system if contamination or debris is present. Because this unit is built for OE-style fitment, it is suited to direct replacement service on 1990-1994 Mazda 323 and 1990-1994 Mazda Protege models.

Quality Assurance

OSC tests the transmission and engine oil coolers before tank installation, checks the radiator core before assembly, and pressure tests the completed unit again after assembly. The design also incorporates factory-spec component fitment and production checks to support consistent quality control.