OE Quality
60-Day Returns

Denso 221-3309 Radiator
Overview of Denso Radiator for Mitsubishi Diamante
The Denso 221-3309 radiator is engineered specifically for Mitsubishi Diamante models, providing reliable cooling performance. Designed with precise core dimensions and integrated transmission oil cooler, this radiator supports efficient engine operation under various driving conditions.
- Core Height: 15.75 inches
- Core Width: 28.25 inches
- Core Thickness: 1.00 inch
- Inlet Diameter: 1.375 inches
- Outlet Diameter: 1.375 inches
- Includes Transmission Oil Cooler
Detailed Radiator Specifications and Features
The Denso 221-3309 radiator features a core height of 15.75 inches and a width of 28.25 inches, providing ample surface area for heat dissipation. Its 1-inch core thickness balances cooling efficiency with durability. Both the inlet and outlet diameters measure 1.375 inches, ensuring compatibility with the Mitsubishi Diamante’s cooling system hoses. The integrated transmission oil cooler enhances the radiator’s functionality by helping maintain optimal transmission fluid temperatures, which is critical for transmission longevity and performance.
Compatible Vehicles and Application
This radiator is compatible with Mitsubishi Diamante models, designed to meet the specific cooling requirements of this vehicle. The part number 221-3309 ensures exact fitment and performance, making it a suitable replacement for the factory radiator in these vehicles.
- Overheating issues due to radiator core damage or clogging
- Coolant leaks from cracked or corroded radiator tanks
- Transmission fluid overheating caused by faulty or missing transmission oil cooler
- Reduced engine cooling efficiency from worn or undersized radiators
- Physical damage from road debris or accidents affecting radiator integrity
Installation Notes and Tips
When installing the Denso 221-3309 radiator on a Mitsubishi Diamante, ensure all hose connections match the 1.375-inch inlet and outlet diameters for a secure fit. Drain the coolant and transmission fluid before removal of the old radiator. Inspect and replace any worn hoses or clamps to prevent leaks. Properly bleed the cooling system after installation to avoid air pockets that can impair cooling performance.
Quality Assurance and Warranty
Denso radiators are manufactured to meet OEM specifications, ensuring reliable performance and durability. The 221-3309 radiator undergoes rigorous quality control testing to verify core integrity and cooling efficiency. Warranty coverage details should be confirmed with the distributor or manufacturer, typically covering defects in materials and workmanship.
| Brand | Denso |
|---|---|
| Part Number | 221-3309 |
| Core Height | 15.7500 |
| Core Thickness | 1.0000 |
| Core Width | 28.2500 |
| Inlet Diameter | 1.3750 |
| Outlet Diameter | 1.3750 |
| Transmission Oil Cooler Included | YES |
This part fits 8 vehicles. Search below:
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 2004 | Mitsubishi | Diamante | N/A | |
| 2003 | Mitsubishi | Diamante | N/A | |
| 2002 | Mitsubishi | Diamante | N/A | |
| 2001 | Mitsubishi | Diamante | N/A | |
| 2000 | Mitsubishi | Diamante | N/A | |
| 1999 | Mitsubishi | Diamante | N/A | |
| 1998 | Mitsubishi | Diamante | N/A | |
| 1997 | Mitsubishi | Diamante | N/A |
* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
This part directly replaces or is cross-referenced with the following part numbers:
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.