Koyorad A13021-1 Radiator

Koyorad A13021-1 Radiator for Subaru Forester

The Koyorad A13021-1 radiator is an OE-equivalent replacement built for 2003-2008 Subaru Forester applications. It uses an aluminum core with plastic tanks to match the original cooling system layout and support reliable heat transfer in daily driving conditions.

Key Features

• Direct-fit radiator for 2003-2008 Subaru Forester
• Aluminum core construction for efficient cooling performance
• Single-row core design
• Plastic tank construction
• 1.5 in. inlet and 1.5 in. outlet diameters
• Integrated transmission oil cooler connection with 1.25 in. diameter
• Core dimensions: 27.9375 in. wide, 14.1875 in. high, 0.625 in. thick

Detailed Description

Koyorad A13021-1 is a replacement radiator engineered for Subaru Forester models from 2003 through 2008. Koyorad focuses on OE-equivalent cooling components, and this radiator follows that approach with an aluminum core, plastic end tanks, and factory-style hose and cooler connections. For drivers searching for a Subaru Forester radiator replacement, Koyorad A13021-1 provides the correct fitment profile for the listed model years.

This radiator is designed for vehicles with the original cooling system layout and is a practical choice when replacing a leaking, clogged, or damaged radiator on a Subaru Forester. The core size and connection diameters are specified to match the application, helping maintain proper coolant flow and transmission cooler routing.

Common Problems This Part Can Address

• Coolant leaks from a cracked or corroded radiator
• Overheating caused by restricted coolant flow
• Damaged inlet or outlet necks
• Transmission cooler connection issues at the radiator
• Reduced cooling efficiency from an aging factory radiator

Installation Notes and Tips

Verify hose diameter, core dimensions, and transmission cooler connection size before installation. Drain the cooling system fully, inspect hoses and clamps for wear, and refill with the correct coolant mixture after installation. Bleed air from the system according to Subaru service procedures to help prevent hot spots and temperature fluctuations. Fits 2003-2008 Subaru Forester, N/A.

Quality Assurance

Koyorad manufactures OE-equivalent radiators using application-specific engineering and cooling-system experience. Part number A13021-1 is built to match the listed Subaru Forester fitment and cooling connection requirements.