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Denso 221-9164 Radiator

Brand	Denso 221-9164
Core Height	16.7323
Core Thickness	1.0236
Core Width	25.9055
Inlet Diameter	1.3780
Outlet Diameter	1.3780
Transmission Oil Cooler Included	YES
Fits	Cadillac · 2 vehicles

OE experience. Built to meet strict OE standards for fit, performance, and reliability.

Radiator performance. Helps maintain proper engine cooling and function.

Durability tested. Passed rigorous function and durability checks for dependable service.

Cross-references ACDelco 21455, ACDelco 25750930 and APDI 8012565 for the same application. See all 10.

$163.58Free shipping

In stock · usually ships same day before 1pm CST

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Denso Radiator for 2003-2004 Cadillac CTS

This Denso radiator, part number 221-9164, is built for direct-fit cooling system service on the 2003-2004 Cadillac CTS. It is engineered to match OE-style dimensions and cooling performance requirements for dependable engine temperature control.

Key Features

Core height: 16.7323 in.
Core width: 25.9055 in.
Core thickness: 1.0236 in.
Inlet diameter: 1.3780 in.
Outlet diameter: 1.3780 in.
Transmission oil cooler included
Built to OE manufacturer standards for fitment and function

Detailed Description

Denso part number 221-9164 is a radiator assembly developed for the 2003-2004 Cadillac CTS. Denso supplies radiators to OE vehicle manufacturers worldwide, and this unit reflects that OE-focused engineering with tank design, fin pitch, core dimensions, and materials selected to meet strict factory specifications. The result is a radiator intended to support stable engine cooling and consistent heat exchange under demanding driving conditions. This radiator also includes a transmission oil cooler, making it a practical replacement for vehicles that use integrated cooling for the transmission circuit.

This part cross-references Spectra Premium CU2565 for the same application.

What It Helps Address

Overheating caused by a leaking or restricted radiator
Coolant loss from cracked tanks or damaged core passages
Reduced cooling efficiency in a 2003-2004 Cadillac CTS
Transmission fluid temperature control when the original cooler is compromised
Fitment issues from a radiator that does not match OE dimensions

Installation Notes and Tips

Verify inlet and outlet hose diameters before installation and confirm the radiator matches the original core size and cooler configuration. Inspect hoses, clamps, and the cooling fan system during replacement, and flush the cooling system if contamination or debris is present. For a 2003-2004 Cadillac CTS radiator replacement, confirm all connections are clean and properly seated before refilling and bleeding the system.

Quality Assurance

Denso radiators are produced using OE experience and undergo durability and function testing before release. Part number 221-9164 is built to meet rigid manufacturer standards for performance, reliability, and fitment on the Cadillac CTS.

This part fits 2 vehicles

Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

Year	Make	Model	Position	Notes
2004	Cadillac	CTS	N/A	—
2003	Cadillac	CTS	N/A	—
No rows match your filter.

Directly replaces or cross-references 10 part numbers

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.

ACDelco — 21455ACDelco — 25750930APDI — 8012565Cadillac — 25740111Cadillac — 25750930DPI Performance Racing Products — 2565OSC — 2565Reach Cooling — 41-2565Spectra Premium — CU2565TYC Cooling - Archived — 2565