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Koyo HH010647 radiator unmounted view showing aluminum core and tanks
Koyo HH010647 radiator for Toyota Aristo and Lexus GS300 front view
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Koyo HH010647 Radiator for Toyota Aristo and Lexus GS300

Koyo
KOYHH010647
847839021864
Radiators
1 Units In Stock - Ships Next Business Day
Cooling, Engine, Koyo, Radiators
$ 796.00 $ 571.82
$ 571.82

Koyo Hyper Core Radiator for Toyota Aristo and Lexus GS300

This Koyo HH010647 radiator is a 48mm Hyper Core all-aluminum replacement radiator built for the 1997-2005 Toyota Aristo and 1998-2005 Lexus GS300. It replaces the aging factory plastic-tank radiator with a fully hand-welded aluminum design for improved durability and cooling efficiency.

Key Features

  • 48mm Hyper Core - High-density core construction delivers maximum cooling efficiency
  • Direct Bolt-On Fitment - Installs without cutting, modification, or extra parts
  • All-Aluminum Hand-Welded Construction - Replaces the factory OEM plastic-tank radiator with a more durable design
  • OEM Fan and Shroud Compatible - Maintains factory airflow specification with the stock fan and shroud
  • Brushed Aluminum Finish - Koyorad's signature finish
  • Triple Pressure-Tested - Individually tested in Koyorad's ISO 9001-certified factory

Fitment

Year Make Model
1997-2005 Toyota Aristo
1998-2005 Lexus GS300

Specifications

Detail Value
Brand Koyo
Part Number HH010647
Core Thickness 48mm
Core Series Hyper Core
Material Aluminum
Finish Brushed aluminum

What's Included

  • Koyo HH010647 radiator

About Koyo

Koyorad manufactures aluminum performance radiators from its privately owned, ISO 9001-certified factory, hand-welding and triple pressure-testing each unit for direct-fit OEM-specification performance cooling.

FAQ

Does this radiator work with the factory cooling fan

Yes. This radiator is compatible with the OEM fan and shroud and maintains the factory airflow specification.

Do I need to modify anything to install this radiator

No. This radiator is a direct bolt-on fitment that requires no cutting, modification, or additional parts.

What is the core material and construction

The core and tanks are all-aluminum and hand-welded, replacing the factory plastic-tank design with a more durable all-metal construction.

Is this radiator compatible with an automatic transmission cooler

Check your specific transmission cooler configuration before ordering, since not all aftermarket radiators include integrated automatic transmission cooling lines.

What does the 48mm Hyper Core designation mean

It refers to the core thickness and high-density fin design that Koyo uses to maximize cooling efficiency in this radiator line.

Does this fit both the Toyota Aristo and Lexus GS300

Yes. The Toyota Aristo and Lexus GS300 share the same chassis platform for these model years, so this radiator fits both under the applications listed.

How is quality control handled for this radiator

Each unit is individually triple pressure-tested in Koyorad's ISO 9001-certified factory before shipping.

What finish does this radiator have

It is finished in Koyorad's signature brushed aluminum finish.

Installation Instructions

  1. Drain the factory coolant and disconnect the negative battery terminal before beginning
  2. Remove the factory fan shroud, fan, and radiator hoses
  3. Remove the factory radiator and transfer the OEM fan and shroud to the new Koyo radiator
  4. Install the Koyo HH010647 radiator using the factory mounting points
  5. Reconnect all hoses and the fan shroud assembly
  6. Refill the cooling system with the manufacturer-specified coolant and bleed air from the system
  7. Start the engine and check for leaks while monitoring coolant temperature

Request For Information

Have questions about Koyo HH010647 Radiator for Toyota Aristo and Lexus GS300? Fill out the form below and we'll get back to you by the next business day.
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