Denso 221-3510 Radiator

Denso 221-3510 Radiator for Mazda 6

The Denso 221-3510 radiator is an OE-style cooling replacement built for 2006-2008 Mazda 6 applications. It is engineered around factory dimensions and cooling requirements to support consistent engine temperature control and dependable fitment.

Key Features

• Core height: 14.8750
• Core width: 28.6870
• Core thickness: 0.6250
• Inlet diameter: 1.2500
• Outlet diameter: 1.2500
• Transmission oil cooler included: yes
• OE-focused radiator design from Denso

Detailed Description

Built for the Mazda 6, part number 221-3510 uses radiator dimensions and materials aligned with OE standards for proper cooling performance and fitment. The integrated transmission oil cooler adds support for vehicles that route transmission fluid through the radiator, while the 1.2500-inch inlet and outlet sizes help match factory hose connections. Denso’s OE supply experience is reflected in the radiator’s configuration, fin pitch, tank design, and core sizing, all of which are selected to meet demanding cooling requirements.

Fits 2006-2008 Mazda 6, N/A. This part cross-references Mazda (e.g., L3R1-15-200A) for the same application.

Common Cooling Issues This Part May Address

• Engine overheating caused by reduced radiator efficiency
• Coolant leaks from a damaged or aging radiator
• Poor heat transfer from clogged or corroded cooling passages
• Transmission temperature concerns when the cooler circuit is part of the radiator
• Fitment problems from an incorrect replacement radiator

Installation Notes and Tips

Verify core dimensions, inlet and outlet sizes, and transmission cooler routing before installation. Inspect hoses, clamps, and coolant condition during replacement, and confirm the cooling system is properly bled after installation. For Mazda 6 models, match the radiator to the vehicle’s year and cooling configuration listed above.

Quality Assurance

Denso radiators are built to OE-level standards and undergo durability and function testing before release. That testing helps ensure reliable cooling performance and consistent fitment for 2006-2008 Mazda 6 vehicles.