Heating and Cooling› Thermostats, Housings and Fillers

BMW Genuine Parts

Expansion Tank Cap

$23.00

SKU: 17117639021

In Stock
In Stock
Ships by Sep 9
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Beginner — under 30 min

Overview

The BMW Genuine Parts 17117639021 is an expansion tank cap designed as a direct replacement for various BMW models. It is also referred to as a radiator cap or reservoir cap and replaces part number 17-13-7-516-004. This cap is engineered to maintain a tight seal and includes a pressure relief at 2.0 bar.
Show original supplier description
The BMW Genuine Parts 17117639021 is a direct replacement expansion tank cap, also known as a radiator cap or reservoir cap. Designed specifically for BMW's larger primary expansion tanks, this cap ensures a secure seal to maintain optimal cooling system pressure. It is engineered to vent safely only when pressure surpasses 2.0 bar, preventing potential damage to the system. This genuine BMW part is built to BMW's rigorous standards, utilizing reliable materials for long-lasting performance and durability. It directly replaces part number 17-13-7-516-004. This expansion tank cap is compatible with a wide range of BMW models from 2004 through 2025, including various 5 Series (E60, F10), M3, X5, M8, and more. Specific fitment details are available for vehicles such as the 2004-2007 BMW 525i and 530i, 2008-2011 BMW 528i, and 2008-2013 BMW 535i, among others. It is recommended to verify fitment with your specific vehicle's VIN.

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

BrandBMW Genuine Parts
Part Number17117639021
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.

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