Denso 221-3173 Radiator

Denso 221-3173 Radiator for Lexus GS430

The Denso 221-3173 radiator is built for 2001-2005 Lexus GS430 applications that require OE-style cooling performance and precise fitment. It uses core dimensions, tank design, fin pitch, and materials that follow original equipment standards for dependable engine temperature control.

With a built-in transmission oil cooler and 1.562-inch inlet and outlet diameters, this radiator supports proper coolant flow and heat exchange in demanding driving conditions. It is a direct-fit cooling replacement for Lexus GS430 owners looking for a radiator that matches factory specifications.

Key Features

• Fits 2001-2005 Lexus GS430, N/A
• Part number: 221-3173
• Core height: 15.8120 in.
• Core width: 29.4370 in.
• Core thickness: 0.6250 in.
• Transmission oil cooler included
• Inlet diameter: 1.5620 in.
• Outlet diameter: 1.5620 in.
• OE-style radiator construction for factory-like fit and function

Product Details

Denso supplies radiators to original equipment vehicle manufacturers worldwide, and the 221-3173 reflects that OE engineering approach. The radiator configuration is built to meet strict manufacturer standards for core dimensions, fin pitch, tanks, and materials, helping maintain stable engine cooling and consistent operation in the Lexus GS430. This part cross-references Lexus 16400-50260 for the same application.

What This Radiator Helps Address

• Overheating caused by a restricted or leaking radiator
• Coolant loss from cracked tanks or damaged core sections
• Poor heat transfer from an aging factory radiator
• Transmission fluid temperature control concerns when the cooler circuit is part of the system
• Fitment issues from non-OE replacement radiators

Installation Notes and Tips

Before installation, verify the radiator dimensions and hose connection sizes against the original unit. Inspect hoses, clamps, and coolant condition at the same time, and flush the cooling system if contamination or debris is present. After installation, refill with the correct coolant specification and bleed air from the system according to Lexus service procedures.

Quality Assurance

Denso radiators are manufactured to OE-level standards and undergo durability and function testing before release. That testing process helps confirm reliable cooling performance and proper fitment for 2001-2005 Lexus GS430 applications.