Koyorad A2309 Radiator

Koyorad A2309 Radiator for Explorer and Mountaineer

The Koyorad A2309 radiator is an OE-equivalent replacement built for cooling-system service on select Ford and Mercury SUVs. It features an aluminum core with plastic tanks and includes an internal transmission oil cooler for vehicles that use integrated fluid cooling.

Compatible With 2000-2003 Ford Explorer, 2001-2003 Ford Explorer Sport, 2001-2003 Ford Explorer Sport Trac, and 2000-2001 Mercury Mountaineer. This Koyorad radiator is a direct-fit cooling replacement for applications that require a 1.5-inch inlet and outlet and an integrated transmission cooler.

Key Features

• OE-equivalent radiator replacement from Koyorad
• Aluminum core with plastic tank construction
• Single-row core design
• Internal transmission oil cooler included
• Core dimensions: 20.75 in. height, 25.25 in. width, 1 in. thickness
• Inlet and outlet diameter: 1.5 in.
• Transmission oil cooler diameter: 1.625 in.

Product Details

Koyorad A2309 is engineered as a replacement radiator for Ford Explorer, Explorer Sport, Explorer Sport Trac, and Mercury Mountaineer models within the listed years. The aluminum core supports heat transfer, while the plastic tanks match common OE-style radiator construction. Because this unit includes an internal transmission oil cooler, it serves vehicles that route automatic transmission fluid through the radiator for temperature control. Koyorad Radiator products are built with the technical experience needed to replace the original cooling component with a direct-fit solution.

Common Problems This Radiator Can Address

• Coolant leaks from a damaged or corroded radiator
• Overheating caused by restricted or inefficient heat exchange
• Transmission fluid temperature issues related to a failing internal cooler
• Cracked plastic tanks or weakened radiator seams
• Reduced cooling performance in high-mileage Ford Explorer and Mercury Mountaineer applications

Installation Notes and Tips

Verify inlet and outlet sizing, core dimensions, and transmission cooler connections before installation. Drain coolant safely, inspect hoses and clamps for wear, and confirm the replacement radiator matches the vehicle’s cooling and transmission-cooling layout. For 2001-2003 Ford Explorer Sport and 2001-2003 Ford Explorer Sport Trac SOHC applications, confirm engine configuration before ordering. Professional installation is recommended for proper coolant refill and system bleeding.

Quality Assurance

Koyorad manufactures OE-style replacement radiators using application-specific engineering and cooling-system fitment standards. Part number A2309 is built to serve the listed Ford Explorer and Mercury Mountaineer applications with the specified radiator and transmission cooler configuration.