What is the primary benefit of an aluminum radiator over a stock copper/brass one?

Aluminum radiators, like this Koyo unit, are generally lighter than stock copper and brass radiators. They also offer improved heat transfer capabilities, meaning they can dissipate engine heat more effectively to help maintain a stable operating temperature.

Does this radiator come with a new radiator cap?

This Koyo radiator does not include a new radiator cap. It is recommended to reuse your existing cap if it is in good condition, or purchase a new one separately to ensure proper system pressure.

What else should I consider when replacing my radiator?

When replacing your radiator, it's a good practice to inspect your coolant hoses for any signs of wear or leaks. You should also consider flushing your cooling system to remove any old coolant and sediment before installing the new radiator and refilling with fresh coolant.

2006-2013 Lexus IS250/IS350 Radiator | Koyo KH011937

Name: Koyo 06-13 Lexus IS250/IS350 2.5L/3.5L (6MT/AT) Radiator
Brand: Koyo
SKU: koyo-koyo-06-13-lexus-is250-is350-2-5l-3-5l-6mt-at-radiator-t14-190901
Price: 457.92 USD
Availability: BackOrder

Koyo 06-13 Lexus IS250/IS350 2.5L/3.5L (6MT/AT) Radiator

$457.92

On Backorder — Expected to ship by Apr 25, 2026

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Fits 2006-2013 Lexus IS250/IS350. Koyo aluminum radiator for improved cooling performance.

Key Features

Fits 2006-2013 Lexus IS250 and 2006-2013 Lexus IS350.
All-aluminum construction for efficient heat dissipation and reduced weight.
Designed as a direct-fit replacement for easy installation in the factory location.
Suitable for both manual (6MT) and automatic (AT) transmission models.
Koyo is a well-known brand in the cooling system aftermarket.

Secure CheckoutFast Shipping631-982-0042

Product Details

This is a Koyo aluminum radiator designed specifically for the 2006 through 2013 Lexus IS250 and IS350 models, whether they have a 6-speed manual or automatic transmission. If your stock radiator is leaking or not keeping up with engine heat, especially if you've noticed your temperature gauge creeping up, this is a solid replacement option that offers improved cooling capacity.

Koyo builds these radiators with a focus on efficient heat transfer. The core is constructed from aluminum, which is a lighter material than stock copper and brass and also dissipates heat more effectively. This means your engine coolant can shed heat more readily, helping to maintain a more stable operating temperature under various driving conditions. The direct-fit design means it's made to install in the factory location, using the original mounting points and hose connections, which simplifies the installation process.

When replacing your radiator, it's a good time to also inspect your coolant hoses for any signs of wear or cracking, and consider flushing your cooling system to remove any old sediment before adding new coolant.