Denso 221-9378 Radiator

Denso 221-9378 Radiator Overview

The Denso 221-9378 radiator is built for dependable engine cooling and stable operating temperatures. As an OE-focused replacement radiator, it uses core dimensions, tank design, fin pitch, and materials that align with original manufacturer standards for fit and function.

This radiator includes an integrated transmission oil cooler and is sized with a 13.7800-inch core height, 29.2100-inch core width, and 0.9800-inch core thickness. Inlet and outlet diameters measure 1.3750 inches and 1.3600 inches, respectively, supporting proper coolant flow in the correct application.

Key Features

• Part number 221-9378 radiator for OE-style cooling replacement
• Transmission oil cooler included
• Core height: 13.7800 in.
• Core width: 29.2100 in.
• Core thickness: 0.9800 in.
• Inlet diameter: 1.3750 in.
• Outlet diameter: 1.3600 in.

Detailed Description

Denso designs this radiator to meet rigid OE standards for performance, reliability, and fitment. The radiator core dimensions and connection sizes are important for vehicles that require precise cooling-system matching, especially when replacing a worn or leaking unit. For Suzuki applications and other OE cross-reference use cases, 221-9378 supports direct replacement needs where the original radiator includes a transmission oil cooler.

This part cross-references Spectra Premium CU2451 and Suzuki 17700-54G20 for the same application. When selecting a replacement radiator for a Suzuki model, confirm the original core size, hose connection diameters, and transmission cooler layout before installation.

Common Problems This Radiator Can Address

• Engine overheating caused by a restricted or damaged radiator core
• Coolant leaks from cracked tanks or aging seams
• Transmission fluid temperature issues when the original cooler is compromised
• Poor coolant circulation from internal blockage or corrosion
• Fitment issues after replacing a radiator with incorrect dimensions

Installation Notes and Tips

Before installation, compare the original radiator to the Denso 221-9378 by core height, core width, core thickness, inlet diameter, and outlet diameter. Verify that the vehicle uses a radiator with an integrated transmission oil cooler and inspect hoses, clamps, and mounting points for wear. Flush the cooling system if contamination or corrosion is present, and refill with the correct coolant specification after installation.

Compatible With Suzuki radiator applications where the original equipment dimensions and cooler configuration match this unit. For Suzuki and related OE replacement searches, use the part number 221-9378 to confirm the correct radiator before ordering.

Quality Assurance

Denso supplies radiators to OE car makers worldwide, and its radiator designs are validated through durability and function testing. That OE experience supports consistent performance, reliable fitment, and dependable cooling under demanding driving conditions.