Denso 221-9578 Radiator

Denso Radiator for Lexus IS300 and IS200t

The Denso 221-9578 radiator is built for direct-fit engine cooling performance in select Lexus applications. It is engineered to match OE radiator dimensions and materials, with core sizing and tank configuration that support proper fitment in the vehicle’s cooling system.

For Lexus IS300 and Lexus IS200t owners searching for a radiator replacement by part number, Denso 221-9578 offers an OE-style solution backed by Denso’s radiator manufacturing experience.

Key Features

• Core height: 15.7500 in.
• Core width: 28.4375 in.
• Core thickness: 1.0625 in.
• Inlet diameter: 1.5000 in.
• Outlet diameter: 1.5000 in.
• No transmission oil cooler included
• OE-matched radiator configuration for proper fitment

Detailed Product Overview

Denso 221-9578 is a radiator built to OE specifications for select Lexus cooling systems. Denso supplies radiators to original equipment vehicle manufacturers worldwide, and this radiator reflects that OE-focused engineering with controlled core dimensions, fin pitch, tank design, and material selection. The result is a radiator intended to maintain stable engine temperature and consistent cooling-system operation in daily driving and demanding conditions.

This part cross-references Lexus 16400-36130 for the same application. It is a direct replacement choice for Lexus IS300 radiator replacement searches and Lexus IS200t cooling system service, including 2020-2024 Lexus IS300, 2018-2019 Lexus IS300, and 2016-2017 Lexus IS200t applications. The Denso 221-9578 part number is also commonly used when comparing OE-style radiator options for these vehicles.

What It Helps Address

• Overheating caused by a worn or inefficient radiator
• Coolant temperature instability during stop-and-go driving
• Leaks from an aging radiator core or tank assembly
• Reduced cooling performance from clogged or damaged radiator passages
• Fitment issues when replacing an OE radiator with the correct dimensions

Installation Notes and Tips

Verify radiator dimensions, inlet and outlet size, and transmission cooler requirements before installation. This radiator does not include a transmission oil cooler, so confirm your vehicle’s original cooling-system configuration matches that setup. Inspect hoses, clamps, and coolant condition during replacement to help ensure a complete repair.

Compatible With: Fits 2020-2024 Lexus IS300, N/A; Fits 2018-2019 Lexus IS300, N/A; Fits 2016-2017 Lexus IS200t, N/A.

Quality Assurance

Denso radiators are built to meet OE manufacturer standards and are subjected to durability and function testing before release. That OE supplier background supports consistent fitment and dependable cooling performance for Lexus IS300 and Lexus IS200t radiator replacement needs.