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Heating and Cooling› Thermostats, Housings and Fillers

Lexus

Radiator Cap

$26.93 $19.91 Save $7.02

SKU: 16401-31650

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

Beginner — under 30 min

Overview

It is also known as a Radiator Cap. This component is manufactured by Lexus and built to meet high standards using quality materials for reliability and durability.
Show original supplier description
The Lexus Radiator Cap Sub-Assembly, part number 16401-31650, is a genuine OEM replacement designed to restore the proper function of your vehicle's cooling system. This component is officially referred to as a Cap Sub-Assy, Radiator and is also commonly known as a Radiator Cap. It is manufactured by Lexus to meet strict factory specifications, ensuring reliable performance and durability. This radiator cap replaces previous part numbers 16401-5B630 and 16401-75440. It features a direct replacement fitment type, making installation straightforward for compatible vehicles. The specifications include dimensions of 2.7 x 2.7 x 2.8 inches and a weight of 1.50 Pounds. This genuine Lexus part is guaranteed by the Lexus factory warranty. It is specifically designed to fit various Lexus models including the GS300 (2006), GS350 (2007-2011), GS430 (2006-2007), GS450h (2007-2011), GS460 (2008-2011), GX470 (2003-2009), IS250 (2006-2012), and IS350 (2006-2012). Please ensure your vehicle's year, model, and engine specifications match the listed fitment to guarantee compatibility.

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

BrandLexus
Part Number16401-31650
CategoryHeating and Cooling
5,000+ Trusted brands
1M+ Enthusiasts
5M+ Parts sold
(760) 282-4645 hello@motormia.co

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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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