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Denso 221-3704 Radiator
| Brand | Denso 221-3704 |
|---|---|
| Core Height | 25.0620 |
| Core Thickness | 0.6250 |
| Core Width | 18.6250 |
| Inlet Diameter | 1.3750 |
| Outlet Diameter | 1.3750 |
| Transmission Oil Cooler Included | YES |
| Fits | Hyundai and Kia · 21 vehicles |
OE experience. Built to 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 assembly.
Cross-references APDI 8012831, CSF 3188 and CSF 3406 for the same application. See all 13.
Denso 221-3704 Radiator for Hyundai and Kia
The Denso 221-3704 radiator is built for direct-fit cooling performance in select Hyundai and Kia applications. It combines OE-style dimensions with an integrated transmission oil cooler to support stable engine temperature control and dependable heat exchange.
Key Features
- Core height: 25.0620 in.
- Core width: 18.6250 in.
- Core thickness: 0.6250 in.
- Inlet diameter: 1.3750 in.
- Outlet diameter: 1.3750 in.
- Transmission oil cooler included
- OE-based radiator configuration for fitment accuracy
Detailed Description
Denso 221-3704 is a replacement radiator engineered around OE specifications for cooling system performance, fitment, and durability. Denso supplies radiators to vehicle manufacturers worldwide, and this unit reflects that OE experience through its tank design, fin pitch, core dimensions, and material selection. For drivers searching for a radiator for 2006-2010 Hyundai Azera, 2006-2010 Hyundai Sonata, or 2006-2010 Kia Optima, this part number provides a direct-fit cooling solution with the correct inlet and outlet sizing and an integrated transmission oil cooler.
This radiator cross-references Spectra Premium CU2831 for the same application.
What It Helps Address
- Engine overheating from a restricted or leaking radiator
- Transmission fluid temperature control concerns when the cooler circuit is part of the radiator
- Coolant loss caused by cracked tanks or damaged core passages
- Poor heat dissipation from worn internal fins or clogged cooling channels
- Fitment issues when replacing an OE-style radiator on Hyundai Azera, Sonata, or Kia Optima models
Installation Notes and Tips
Verify radiator dimensions, inlet and outlet diameter, and transmission cooler connections before installation. Flush the cooling system, inspect hoses and clamps, and confirm the transmission cooler lines are clean before reconnecting. After installation, refill with the correct coolant mixture and bleed air from the system according to the vehicle service procedure. Fits 2006-2010 Hyundai Azera, N/A. Fits 2006-2010 Hyundai Sonata, N/A. Fits 2006-2010 Kia Optima, N/A.
Quality Assurance
Denso radiators are manufactured to meet OE standards and are subjected to durability and function testing before release. That OE-focused process helps ensure consistent cooling performance, reliable fitment, and long-term service in demanding driving conditions.
| Year | Make | Model | Submodel | Transmission | Position | Notes |
|---|---|---|---|---|---|---|
| 2010 | Hyundai | Azera | — | — | N/A | — |
| 2010 | Hyundai | Sonata | — | — | N/A | — |
| 2010 | Hyundai | Sonata | SE | — | N/A | — |
| 2010 | Hyundai | Sonata | Limited | — | N/A | — |
| 2010 | Hyundai | Sonata | GLS | Automatic | N/A | — |
| 2010 | Kia | Optima | — | — | N/A | — |
| 2009 | Hyundai | Azera | — | — | N/A | — |
| 2009 | Hyundai | Sonata | — | — | N/A | — |
| 2009 | Hyundai | Sonata | SE | Automatic | N/A | — |
| 2009 | Hyundai | Sonata | Limited | — | N/A | — |
| 2009 | Hyundai | Sonata | GLS | Automatic | N/A | — |
| 2009 | Kia | Optima | — | — | N/A | — |
| 2008 | Hyundai | Azera | — | — | N/A | — |
| 2008 | Hyundai | Sonata | — | — | N/A | — |
| 2008 | Kia | Optima | — | — | N/A | — |
| 2007 | Hyundai | Azera | — | — | N/A | — |
| 2007 | Hyundai | Sonata | — | — | N/A | — |
| 2007 | Kia | Optima | — | — | N/A | — |
| 2006 | Hyundai | Azera | — | — | N/A | — |
| 2006 | Hyundai | Sonata | — | — | N/A | — |
| 2006 | Kia | Optima | — | — | N/A | — |
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