Koyorad A2681 Radiator
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Koyorad

Koyorad A2681 Radiator

Brand Koyorad A2681
Core Height 26.375
Core Material Aluminum
Core Row Quantity 1
Core Thickness 0.625
Core Width 20.125
Inlet Diameter 1.5
Internal Transmission Oil Cooler Yes
Outlet Diameter 1.3125
Tank Material Aluminum
Title Koyorad a2681 radiator
Tow Packaging Without tow
Transmission Oil Cooler Diameter 1.625
Transmission Oil Cooler Included Yes
Fits Toyota · 2 vehicles

OE equivalent radiator. Built to deliver a direct replacement fit and function.

Aluminum construction. Lightweight core and tanks help promote efficient heat transfer.

Transmission oil cooler included. Adds integrated cooling for the transmission system.

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Koyorad A2681 Radiator for Toyota Sienna

The Koyorad A2681 radiator is an OE-equivalent replacement built for 2004-2005 Toyota Sienna models. It uses an aluminum core and aluminum tanks to support efficient heat transfer and reliable cooling performance in a direct-fit radiator application.

Key Features

  • Fits 2004-2005 Toyota Sienna, N/A
  • OE-style replacement radiator from Koyorad
  • Aluminum core and aluminum tank construction
  • Single-row core design
  • Internal transmission oil cooler included
  • Core dimensions: 26.375 in. height, 20.125 in. width, 0.625 in. thickness
  • Inlet diameter: 1.5 in.; outlet diameter: 1.3125 in.
  • Transmission oil cooler diameter: 1.625 in.

Detailed Description

Built for the 2004-2005 Toyota Sienna, the Koyorad A2681 radiator is engineered as a direct replacement for the factory cooling assembly. Its aluminum core and aluminum tank construction support efficient thermal transfer, while the integrated transmission oil cooler adds the cooling capacity needed for vehicles equipped with an automatic transmission cooler circuit. Koyorad focuses on OE-equivalent replacement radiators, using manufacturing experience and technical know-how to deliver a radiator that matches the application requirements of the Toyota Sienna.

This part number, A2681, is a practical choice when replacing a leaking, clogged, or damaged radiator on a Toyota Sienna. It is also a fitment-based search match for drivers looking for a 2004 Toyota Sienna radiator or 2005 Toyota Sienna radiator with an internal transmission oil cooler.

Common Issues This Radiator Can Address

  • Coolant leaks from a cracked or corroded radiator
  • Overheating caused by restricted coolant flow
  • Transmission fluid temperature concerns related to a failing cooler circuit
  • Reduced cooling efficiency from aged internal radiator passages
  • Physical damage to the radiator core or tanks

Installation Notes and Tips

Verify inlet and outlet hose diameters, cooler line connections, and overall dimensions before installation. Flush the cooling system and inspect hoses, clamps, and related components for wear before installing the new radiator. Confirm that the vehicle is a 2004-2005 Toyota Sienna with the correct radiator configuration before ordering or installation.

Quality Assurance

Koyorad manufactures OE-equivalent radiators with the application-specific engineering needed for proper fit and function. Part number A2681 is built to meet the cooling requirements of the listed Toyota Sienna applications.

Related reading

This part fits 2 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersPositionNotes
2005ToyotaSienna3.3LV6N/A—
2004ToyotaSienna3.3LV6N/A—