Koyorad A2459 Radiator

Koyorad A2459 Radiator for Pathfinder and QX4

The Koyorad A2459 radiator is an OE-equivalent replacement built for 2001-2004 Nissan Pathfinder and 2001-2003 INFINITI QX4 applications. It combines an aluminum core with plastic tanks and includes an internal transmission oil cooler for direct-fit cooling system service.

Key Features

• Fits 2001-2004 Nissan Pathfinder, N/A
• Fits 2001-2003 INFINITI QX4, N/A
• Aluminum core with plastic tanks
• Single-row core design
• Core dimensions: 19.6875 in. height, 27.9375 in. width, 0.625 in. thickness
• Inlet and outlet diameter: 1.375 in.
• Internal transmission oil cooler included
• Transmission oil cooler diameter: 1.25 in.

Detailed Description

Koyorad A2459 is a replacement radiator engineered to match OE-style fitment and cooling function for Nissan Pathfinder and INFINITI QX4 models from the early 2000s. The aluminum core supports efficient heat transfer, while the plastic tank construction follows the common factory-style radiator layout used in these vehicles. With an internal transmission oil cooler included, this radiator serves as a direct service part for vehicles equipped with automatic transmission cooling through the radiator.

This part number, A2459, is a practical choice when replacing a leaking, clogged, or damaged radiator on a 2001-2004 Nissan Pathfinder or 2001-2003 INFINITI QX4. Koyorad’s OE-equivalent manufacturing approach focuses on replacement accuracy and consistent cooling-system performance.

What It Is Used For

• Replacing a radiator with cracked tanks or damaged core fins
• Addressing coolant loss from radiator leaks
• Restoring engine cooling performance after overheating symptoms
• Servicing a failed internal transmission oil cooler
• Correcting temperature control issues caused by restricted coolant flow

Installation Notes and Tips

Verify inlet and outlet hose diameter before installation, and confirm that the vehicle uses the radiator-mounted transmission oil cooler configuration. Flush the cooling system, inspect hoses and clamps, and replace worn coolant components as needed during radiator service. The part number A2459 should be matched to the vehicle’s year and model before installation.

Quality Assurance

Koyorad states that its radiators are built as OE-equivalent replacements using technical manufacturing experience focused on first-time replacement accuracy. This radiator is intended for direct replacement service on the listed Pathfinder and QX4 applications.