Denso 221-3505 Radiator

Denso Radiator for Mazda Miata

This Denso radiator, part number 221-3505, is built for 1999-2005 Mazda Miata applications. It is an OE-style cooling replacement with core dimensions and materials engineered to match factory specifications for fitment and thermal performance.

Key Features

• Core height: 12.6250 in.
• Core width: 25.3120 in.
• Core thickness: 0.6250 in.
• Inlet diameter: 1.2500 in.
• Outlet diameter: 1.2500 in.
• No transmission oil cooler included
• Fits 1999-2005 Mazda Miata, N/A

Detailed Description

Denso part number 221-3505 is a direct-fit radiator for the Mazda Miata, engineered around OE radiator configuration standards. Denso supplies radiators to vehicle manufacturers worldwide, and this unit reflects that OE experience through controlled tank design, fin pitch, core sizing, and material selection. For drivers searching for a 1999-2005 Mazda Miata radiator replacement or a Denso 221-3505 radiator for Mazda Miata cooling repair, this part is built to restore proper engine temperature control and dependable heat exchange.

This radiator is also cross-referenced with APDI 8012268 for the same application.

What It Helps Address

• Engine overheating caused by a leaking or restricted radiator
• Coolant loss from cracked tanks or damaged core passages
• Reduced cooling efficiency in stop-and-go driving
• Temperature instability during normal Mazda Miata operation
• Replacement needs after corrosion or age-related wear

Installation Notes and Tips

Verify inlet and outlet hose sizes before installation, and confirm the radiator matches your vehicle’s cooling layout. This unit does not include a transmission oil cooler, so it is suited to applications that do not require that feature. Flush the cooling system, inspect hoses and clamps, and refill with the correct coolant mixture after installation.

Quality Assurance

Denso radiators are manufactured to OE-level standards and undergo durability and function testing before release. The design focus on fitment, core dimensions, and thermal performance supports consistent cooling performance in daily driving conditions.