Denso 221-3604 Radiator

Overview of the Denso Radiator 221-3604 for Subaru Vehicles

The Denso radiator part number 221-3604 is designed specifically for Subaru models including the Forester, Impreza, Legacy, Outback, and XV Crosstrek. This radiator features precise core dimensions and an integrated transmission oil cooler to support efficient engine cooling and transmission performance.

• Core Height: 13.375 inches
• Core Width: 27.062 inches
• Core Thickness: 0.625 inches
• Inlet Diameter: 1.562 inches
• Outlet Diameter: 1.562 inches
• Includes Transmission Oil Cooler

Detailed Specifications and Design Features

The Denso 221-3604 radiator is engineered with a core height of 13.375 inches and a width of 27.062 inches, providing ample surface area for heat dissipation. The core thickness of 0.625 inches balances cooling efficiency with durability. Both the inlet and outlet diameters measure 1.562 inches, ensuring compatibility with the original Subaru cooling system hoses. An integrated transmission oil cooler is included, which helps maintain optimal transmission fluid temperature, enhancing the longevity and performance of the transmission system in Subaru Forester, Impreza, Legacy, Outback, and XV Crosstrek models.

Applications and Common Issues Addressed

• Overheating engine problems in Subaru Forester and Outback vehicles
• Transmission fluid overheating in Subaru Legacy and Impreza models
• Coolant leaks or radiator core damage in Subaru XV Crosstrek
• Reduced cooling efficiency due to clogged or damaged radiator cores
• Maintaining proper engine and transmission temperature for reliable vehicle operation

Installation Notes and Tips

When installing the Denso radiator 221-3604, ensure all hose connections match the 1.562-inch inlet and outlet diameters for a secure fit. It is recommended to inspect and replace any worn hoses or clamps during installation. Properly bleed the cooling system to remove air pockets and verify the transmission oil cooler lines are correctly connected to avoid leaks. Follow Subaru manufacturer guidelines for torque specifications and coolant type to maintain system integrity.

Quality Assurance and Warranty Information

Denso radiators are manufactured to meet or exceed OEM standards for fit, form, and function. The 221-3604 radiator undergoes rigorous quality control to ensure durability and performance in Subaru Forester, Impreza, Legacy, Outback, and XV Crosstrek vehicles. Warranty coverage details should be confirmed with the original equipment provider or authorized distributor.