One Stop Solutions 2278 Radiator

Radiator for Mitsubishi Montero Sport

Restore cooling performance with this OSC Premium New Automotive Radiator, part number 2278. It is built for the Mitsubishi Montero Sport with OE-style form and function, using premium-grade aluminum construction, plastic tanks, and a downflow design for a direct replacement fit.

Fits 1997-2003 Mitsubishi Montero Sport, N/A. Fits 2012-2015 Mitsubishi Montero Sport, N/A.

• OE-style radiator design for factory-like fit and cooling performance
• Premium-grade aluminum core construction with plastic tanks
• Downflow layout with 1-row core design
• Transmission oil cooler included with concentric cooler design
• Core dimensions: 16 3/4 in. height, 25 1/16 in. width, 1 in. thickness
• Inlet and outlet diameters measure 1 3/8 in.
• Pressure tested during production for leak detection and assembly verification
• Engineered for multi-fit applications without changing the original look or fit

Detailed Product Overview

The OSC 2278 radiator is designed for Mitsubishi Montero Sport cooling system service where a direct-fit replacement is needed. It uses cadmium-plated tubes inside and out to help resist premature failure, and the radiator is assembled with a die-cut gasket to support a leak-resistant seal. The transmission oil cooler is built into the unit, and the design follows OE cooler layouts where originally equipped. This part cross-references APDI 8012278 for the same application.

Common Problems This Radiator Can Address

• Overheating caused by a restricted, leaking, or aging radiator
• Transmission fluid temperature concerns related to a worn cooler circuit
• Coolant loss from cracked tanks, failed seals, or core deterioration
• Reduced cooling efficiency in high-mileage Mitsubishi Montero Sport models
• Fitment issues from a damaged or previously repaired radiator assembly

Installation Notes and Quality Assurance

Before installation, verify core dimensions, inlet and outlet sizes, and cooler line routing against the original radiator. Transfer any required fittings or hardware from the vehicle only if they are not already present on the replacement unit. After installation, refill and bleed the cooling system according to factory service procedures and inspect for leaks at the tank seams, hose connections, and transmission cooler fittings.

Each OSC radiator is pressure tested during production, including testing of the cooler circuits before assembly and again after final assembly. The design also incorporates engineering updates aimed at improving durability and cooling performance in higher-mileage vehicles.