Denso 221-3606 Radiator

Denso 221-3606 Radiator for Subaru Impreza

The Denso 221-3606 radiator is built for 2002-2005 Subaru Impreza applications that require OE-style cooling performance and direct fitment. With a 13.3750-inch core height, 27.0620-inch core width, and 1.0000-inch core thickness, it is sized to match the factory cooling layout while supporting consistent engine temperature control.

This radiator includes a transmission oil cooler and uses 1.5000-inch inlet and outlet diameters. Denso’s OE manufacturing background and durability testing help ensure the radiator meets the fitment and function expectations of Subaru Impreza owners looking for a replacement radiator, including the Denso 221-3606.

• Fits 2002-2005 Subaru Impreza
• Core dimensions: 13.3750 in. height x 27.0620 in. width x 1.0000 in. thickness
• Transmission oil cooler included
• 1.5000 in. inlet and outlet diameters
• OE-style radiator construction for factory-style cooling system service

Detailed Product Overview

Denso 221-3606 is a radiator replacement for Subaru Impreza models from 2002 through 2005. It is engineered around OE specifications for core size, tank configuration, fin pitch, and materials, which helps support proper coolant flow and heat transfer in the vehicle’s cooling system. For shoppers searching for a Subaru Impreza radiator, 2002-2005 Subaru Impreza cooling replacement, or Denso 221-3606 radiator fitment, this part matches the listed application directly.

The integrated transmission oil cooler adds an important cooling path for vehicles equipped with automatic transmission cooling through the radiator. As a direct replacement radiator for Subaru Impreza, this unit is intended to restore stable operating temperatures and maintain reliable cooling performance under everyday driving conditions.

Common Problems This Radiator Can Address

• Coolant leaks from a damaged or corroded radiator
• Overheating caused by restricted heat transfer
• Cracked tanks or weakened radiator seams
• Transmission fluid temperature concerns when the cooler circuit is part of the radiator
• Poor cooling performance from an aging Subaru Impreza radiator

Installation Notes and Tips

Verify core dimensions, inlet and outlet size, and transmission cooler routing before installation. Flush the cooling system, inspect hoses and clamps, and confirm the fan shroud and mounting points align with the vehicle before filling with the correct coolant mixture. After installation, bleed air from the system and check for leaks at all hose and cooler connections.

Quality Assurance

Denso supplies radiators to OE vehicle manufacturers worldwide, and this radiator is built using OE-based design standards and durability testing to support dependable fitment and function. The Denso 221-3606 is manufactured to meet the demands of daily driving and cooling system service on compatible Subaru Impreza applications.

This part cross-references APDI 8012703 and CSF 3003 for the same application.