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Genuine BMW 17-11-7-639-021 Coolant Expansion Tank Cap

(BMW Alpina B7 xDrive 2011-12, X5 2007-13, M3 2008-13, 2015, 535i 2008-10, 528i 2008-11, 550i 2006-13, X6 2008-14, 530i 2004-07 + 31 more models)

Part of: Genuine BMW Coolant Expansion Tank Cap

Other options in this family: Genuine BMW 11-61-7-535-849 Genuine BMW 17-13-8-665-638 Genuine BMW 17-12-8-658-482 Genuine BMW 11-66-7-609-924

Manufacturer

Picture for manufacturer Genuine BMW

Part Number

17-11-7-639-021
14 reviews
Sale Price

$33.02

In Stock (10+)

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Usually delivered within 2 days

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Product Details

The Genuine BMW 17-11-7-639-021 Expansion Tank Cap is an OEM replacement pressure cap designed to maintain proper cooling system pressure in BMW vehicles. This cap seals the coolant expansion tank (also known as the overflow tank or reservoir) and ensures the cooling system maintains optimal pressure for efficient heat transfer and prevents coolant boiling at normal operating temperatures.

Key Features:

  • Genuine BMW OEM part ensuring perfect fit and reliability
  • Maintains proper cooling system pressure to prevent overheating
  • Precision-engineered pressure relief valve protects against excessive pressure buildup
  • Durable construction designed to withstand engine bay heat and coolant exposure
  • Direct replacement for worn or damaged expansion tank caps

A properly functioning expansion tank cap is critical for cooling system performance. A faulty cap can lead to coolant loss, air entering the system, overheating, and potential engine damage. This genuine BMW cap ensures your cooling system operates as designed by the manufacturer.

Products specifications

Fits

BMW Alpina B7 xDrive 2011-12, X5 2007-13, M3 2008-13, 2015, 535i 2008-10, 528i 2008-11, 550i 2006-13, X6 2008-14, 530i 2004-07, 650i 2006-10, 2012, 535i xDrive 2009-10, M5 2006-10, 740i 2011-12, M6 2006-10, 750Li 2009-12 + 25 more models

Nice deal

Easy to use website. Good price on right product, shipped promptly.

Nice site easy-to-use check out

Great communication, super fast shipping, and product just as described. Very happy, thank you.

Great price, fast shipping, saved $30 over jegs and summit. Recieved it 4 days after oreder was placed.

i've been to 5 different sites 2 of them were major parts carriers, none of them had the correct parts in stock.

Great Prices

Great shopping experience.

Quick, Easy, great prices!! Thanks!!

Great prices very fast shipping!!!

My experience was quick and easy. Thank you

Easy ordering. Cheap prices. Free shipping or lower shipping would be nice but still better priced

Nice.

Great Price!!!! Nobody beats their price an free shipping.......psshhh

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