Koyorad A2581 Radiator

Koyorad A2581 Radiator for Toyota and Lexus

The Koyorad A2581 radiator is an OE-equivalent replacement built for direct-fit cooling performance in select Toyota and Lexus applications. It features an aluminum core with plastic tanks, integrated transmission oil cooler connections, and the dimensions needed for a proper replacement on compatible vehicles.

Key Features

• Aluminum core construction for efficient heat transfer
• Plastic tank design for OE-style fitment
• 2-row core layout
• Core dimensions: 25.5625 in. height, 24.1875 in. width, 1.4375 in. thickness
• 1.5 in. inlet and 1.5 in. outlet diameters
• Internal transmission oil cooler included
• Transmission oil cooler diameter: 1.0625 in.

Detailed Description

Koyorad A2581 is engineered as a replacement radiator for 2003-2009 Lexus GX470 and 2003-2009 Toyota 4Runner applications. The aluminum core and 2-row design support heat dissipation, while the integrated transmission oil cooler helps maintain proper fluid temperature in vehicles equipped with automatic transmission cooling through the radiator. Koyorad builds OE-equivalent radiators with the technical experience needed to deliver a direct replacement that matches the original cooling system layout.

This part number, A2581, is a practical choice when replacing a worn or leaking radiator on a Toyota 4Runner or Lexus GX470. It is built around the listed core size, inlet/outlet diameters, and cooler configuration to align with the factory-style cooling system.

What It Helps Address

• Coolant leaks from a damaged or aging radiator
• Overheating caused by reduced heat transfer
• Transmission fluid temperature issues related to radiator cooler failure
• Cracked or deteriorated plastic tanks
• Restricted cooling performance from an old radiator core

Installation Notes and Tips

Verify radiator dimensions, inlet and outlet sizes, and transmission cooler connections before installation. Drain coolant and transmission fluid as needed, then inspect hoses, clamps, and mounting points for wear before transferring the new radiator into place. For 2003-2009 Toyota 4Runner and 2003-2009 Lexus GX470 applications, confirm that the vehicle uses the same cooler configuration shown in the fitment data.

Quality Assurance

Koyorad manufactures OE-equivalent replacement radiators using application-specific engineering and cooling-system knowledge. This part cross-references no listed alternate part numbers for the same application.