Denso 221-3155 Radiator

Denso Radiator for 2010 Toyota 4Runner

Denso 221-3155 is a direct-fit radiator built for the 2010 Toyota 4Runner. It is specified with a 25.5620-inch core height, 23.3750-inch core width, and 0.6250-inch core thickness for OE-style cooling system dimensions.

This radiator includes an integrated transmission oil cooler and uses 1.3750-inch inlet and outlet diameters. For buyers searching for a 2010 Toyota 4Runner radiator replacement, Denso 221-3155 provides the fitment and connection points needed for a straightforward cooling system service.

Key Features

• Direct-fit radiator for the 2010 Toyota 4Runner
• Core dimensions: 25.5620 in. height x 23.3750 in. width x 0.6250 in. thickness
• Transmission oil cooler included
• 1.3750-inch inlet and 1.3750-inch outlet diameters
• Denso OE-style construction for consistent fitment
• Part number 221-3155 for catalog and cross-reference lookup

Detailed Description

Denso 221-3155 is engineered as a radiator replacement for the 2010 Toyota 4Runner, with dimensions and hose connections that match the application requirements. Denso supplies radiators to OE vehicle manufacturers worldwide, and this unit reflects that OE-focused engineering approach through its core sizing, tank configuration, fin pitch, and materials selection. The result is a radiator built to support stable engine temperature control and dependable cooling-system operation.

For shoppers comparing 2010 Toyota 4Runner cooling parts, this radiator is a practical OE-style replacement that also includes a transmission oil cooler. The part number 221-3155 is also referenced by Toyota 16400-75441 and several aftermarket listings, making it easier to confirm the correct application during repair planning.

What This Radiator Helps Address

• Overheating caused by a leaking or restricted radiator
• Coolant loss from cracked tanks or damaged core passages
• Transmission fluid temperature control through the built-in cooler
• Poor heat transfer from an aging or corroded radiator
• Cooling system service on a 2010 Toyota 4Runner

Installation Notes and Tips

Verify inlet and outlet hose sizes before installation and confirm the transmission cooler line connections match the vehicle. Flush the cooling system, inspect hoses and clamps, and replace worn seals or related components as needed during radiator service. After installation, refill with the correct coolant mixture and bleed air from the system according to Toyota service procedures.

Quality Assurance

Denso builds radiators to OE manufacturer standards and subjects them to durability and function testing before release. That OE supplier background supports consistent fitment and dependable performance for the 2010 Toyota 4Runner application.