One Stop Solutions 1140 Radiator

Radiator for 1990-1997 Mazda Miata

This OSC Premium radiator is built for the 1990-1997 Mazda Miata with an OE-style downflow layout and integrated transmission oil cooler. Part number 1140 is engineered for direct replacement fitment, stable cooling performance, and a clean factory-style installation.

Key Features

• Fits 1990-1997 Mazda Miata, N/A
• OSC Premium new automotive radiator with OES form and function
• Premium-grade aluminum construction with plastic tanks
• Downflow design with one-row core
• Transmission oil cooler included; concentric cooler type
• Core dimensions: 12 5/8 in. height, 25 1/2 in. width, 1 in. thickness
• 1 1/4 in. inlet and outlet diameters
• Individually pressure tested during production
• Part number 1140

Detailed Description

OSC part number 1140 is a replacement radiator for the Mazda Miata that follows original equipment form and function. It uses premium-grade aluminum components, plastic tanks, and a die-cut gasket design to support leak resistance and consistent cooling performance. The radiator is built as a downflow unit with a concentric transmission oil cooler, making it a direct-fit solution for vehicles that were originally equipped with this style of cooler.

Engineering updates are used to address common failure points found in higher-mileage cooling systems. OSC also fits and torques components to factory specifications and pressure tests each radiator during production. This helps maintain OE-style fitment for the 1990-1997 Mazda Miata while supporting dependable heat transfer and long service life. Part number 1140 is also cross-referenced with Spectra Premium CU1140 for the same application.

Common Problems This Radiator Helps Address

• Overheating caused by a restricted or leaking radiator
• Coolant loss from cracked tanks or worn seals
• Transmission fluid temperature concerns in radiator-equipped cooling systems
• Reduced cooling efficiency from aged core materials
• Fitment issues from non-OE-style replacement radiators

Installation Notes and Tips

Verify the radiator dimensions, inlet and outlet sizes, and transmission cooler layout before installation. This unit is designed for the 1990-1997 Mazda Miata, N/A position, and should be matched to the vehicle’s original cooling configuration. Inspect hoses, clamps, and mounting points during replacement to ensure proper sealing and alignment. Part number 1140 is built for drop-in style replacement, but final fit should always be confirmed against the existing radiator.

Quality Assurance

OSC tests the transmission and engine oil coolers before tank installation, checks the core before assembly, and tests the completed radiator again after assembly. The design also incorporates enhancements such as increased fin density and a thicker core to improve durability in higher-mileage applications.