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Denso 221-3121 Radiator
| Brand | Denso 221-3121 |
|---|---|
| Core Height | 15.8120 |
| Core Thickness | 0.6250 |
| Core Width | 29.4370 |
| Inlet Diameter | 1.3750 |
| Outlet Diameter | 1.5620 |
| Transmission Oil Cooler Included | YES |
| Fits | Lexus · 11 vehicles |
OE experience. Built to meet strict OE standards for reliable performance and fit.
Radiator performance. Helps maintain proper engine cooling and function.
Transmission oil cooler included. Adds integrated cooling support in one radiator assembly.
Cross-references APDI 8012222, CSF 2606 and DPI Performance Racing Products 2222 for the same application. See all 9.
Denso Radiator for Lexus GS300 and GS400
Denso 221-3121 is a direct-fit radiator for select Lexus GS300 and GS400 applications. Built to OE specifications for core size, tank design, fin pitch, and materials, it supports stable engine temperature control and consistent cooling performance.
Key Features
- Core height: 15.8120 in.
- Core width: 29.4370 in.
- Core thickness: 0.6250 in.
- Transmission oil cooler included for automatic transmission applications
- Inlet diameter: 1.3750 in.
- Outlet diameter: 1.5620 in.
- OE-style fitment for Lexus GS300 and Lexus GS400
Detailed Description
This Denso radiator, part number 221-3121, is engineered for 1998-2005 Lexus GS300 and 1998-2000 Lexus GS400 models. Denso supplies radiators to OE vehicle manufacturers worldwide, and this unit reflects that experience with dimensions and construction selected to match factory cooling system requirements. The radiator includes a transmission oil cooler and is built to support reliable heat transfer in daily driving and demanding conditions. This part cross-references Spectra Premium CU2222 and CSF 2606 for the same application.
What This Radiator Helps Address
- Engine overheating from a restricted or leaking radiator
- Coolant loss caused by cracked tanks or damaged core tubes
- Poor heat rejection from an aging cooling system
- Transmission fluid temperature control concerns in equipped vehicles
- Fitment issues when replacing an OE-style Lexus GS300 or GS400 radiator
Installation Notes and Tips
Verify inlet and outlet hose sizes, mounting points, and transmission cooler line connections before installation. Flush the cooling system, inspect hoses and clamps, and refill with the correct coolant mixture after the radiator is installed. Confirm that the radiator cap, thermostat, and cooling fans are functioning properly to protect the new unit and maintain stable operating temperature.
Quality Assurance
Denso radiators are manufactured to meet OE standards for configuration, durability, and function. Each radiator is tested for performance and reliability before release, supporting consistent cooling performance in Lexus GS300 and Lexus GS400 applications.
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 2005 | Lexus | GS300 | N/A | — |
| 2004 | Lexus | GS300 | N/A | — |
| 2003 | Lexus | GS300 | N/A | — |
| 2002 | Lexus | GS300 | N/A | — |
| 2001 | Lexus | GS300 | N/A | — |
| 2000 | Lexus | GS300 | N/A | — |
| 2000 | Lexus | GS400 | N/A | — |
| 1999 | Lexus | GS300 | N/A | — |
| 1999 | Lexus | GS400 | N/A | — |
| 1998 | Lexus | GS300 | N/A | — |
| 1998 | Lexus | GS400 | N/A | — |
| No rows match your filter. | ||||