Heating and Cooling› Radiators

Koyo

All-Aluminum Radiator

$542.20

SKU: KOYHH021568

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

It features all-aluminum construction for improved cooling efficiency and durability over factory plastic-tank radiators. The heli-arc welded design, thicker core, and precise tube and fin alignment promote optimal coolant flow and heat transfer.
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Its all-aluminum construction offers superior heat dissipation and a much longer lifespan compared to stock radiators, which often feature plastic tanks susceptible to expansion and eventual failure under heat cycles. This can lead to overheating and severe engine damage if not addressed promptly. The Koyo radiator's robust build also means it can be welded and repaired if damaged, potentially making it the last radiator you'll need to purchase. Construction details include heli-arc welding for reinforced aluminum connections, a thicker core for increased cooling capacity, and precise tube and fin alignment to optimize coolant flow and heat transfer. Koyo utilizes a state-of-the-art NoClock furnace for brazing tubes, fins, headers, and brackets, ensuring a bond that resists damage from vibration, road debris, and environmental factors. A precision-machined billet filler neck adds to the radiator's durability. The core dimensions are 28.39 inches in width, 15.75 inches in height, and 1.88 inches in depth. Please note that a radiator cap is not included with this unit. Installation of this Koyo radiator requires a complete cooling system flush and refill with a 50/50 mixture of new coolant. This radiator is specifically designed for the 2003-2006 Nissan 350Z models equipped with a manual transmission.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandKoyo
Part NumberKOYHH021568
CategoryHeating and Cooling
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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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