{"product_id":"bevinsee-coolant-expansion-tank-cap-for-bmw-e46-e39-e36-323i-325i-328i-525i-528i-530i-535i-for-bmw-x3-e83-x5-e53-z4-e85-e86","title":"Billet Aluminum Coolant Expansion Tank Cap – BMW E36 \/ E46 \/ E39 \/ X3 \/ X5 \/ Z4 (2.0 Bar)","description":"\u003cdiv\u003e\n\u003cp\u003eUpgrade your cooling system with this billet aluminum coolant expansion tank cap, designed as a direct replacement for aging factory plastic caps commonly found on BMW models. Over time, plastic caps can weaken, discolor, or fail under pressure—this upgraded aluminum cap provides a more durable and refined solution.\u003c\/p\u003e\n\u003ch6\u003eWhy Upgrade Your Coolant Cap?\u003c\/h6\u003e\n\u003cp\u003eAs vehicles age, cooling system components are exposed to constant heat cycles and pressure. Replacing the expansion tank cap helps maintain proper system pressure, reduces the risk of leaks, and restores confidence in your cooling system.\u003c\/p\u003e\n\u003ch6\u003eKey Features:\u003c\/h6\u003e\n\u003cul\u003e\n\u003cli\u003eCNC-machined billet aluminum construction for long-term durability\u003c\/li\u003e\n\u003cli\u003eAnodized surface finish for corrosion resistance and a clean engine bay look\u003c\/li\u003e\n\u003cli\u003eDirect replacement design with no modifications required\u003c\/li\u003e\n\u003cli\u003eRated for proper cooling system pressure (2.0 bar)\u003c\/li\u003e\n\u003cli\u003eIdeal maintenance upgrade for older BMW cooling systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch6\u003eSpecifications:\u003c\/h6\u003e\n\u003cul\u003e\n\u003cli\u003eCondition: Brand New\u003c\/li\u003e\n\u003cli\u003eProduct Type: Coolant Expansion Tank Cap\u003c\/li\u003e\n\u003cli\u003eMaterial: Aluminum Alloy\u003c\/li\u003e\n\u003cli\u003eSurface Finish: Anodized\u003c\/li\u003e\n\u003cli\u003eMaximum Pressure Rating: 2.0 Bar\u003c\/li\u003e\n\u003cli\u003eOEM Reference Numbers: 17111742231, 17110152374, 17111712492, 17111712669, 17117639022\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch6\u003eFitment:\u003c\/h6\u003e\n\u003cul\u003e\n\u003cli\u003eBMW 3 Series E36 (1992–1998)\u003c\/li\u003e\n\u003cli\u003eBMW 3 Series E46 (1999–2005)\u003c\/li\u003e\n\u003cli\u003eBMW 5 Series E39 (1995–2004)\u003c\/li\u003e\n\u003cli\u003eBMW X3 E83 (2003–2006)\u003c\/li\u003e\n\u003cli\u003eBMW X5 E53 (2000–2006)\u003c\/li\u003e\n\u003cli\u003eBMW Z4 E85 \/ E86 (2003–2005)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch6\u003eInstallation Notes:\u003c\/h6\u003e\n\u003cul\u003e\n\u003cli\u003eDirect fit replacement for factory expansion tank cap\u003c\/li\u003e\n\u003cli\u003eNo tools or modifications required\u003c\/li\u003e\n\u003cli\u003eRecommended as part of routine cooling system maintenance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch6\u003eWhat’s Included:\u003c\/h6\u003e\n\u003cul\u003e\n\u003cli\u003e1x Billet Aluminum Coolant Expansion Tank Cap\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch6\u003eBuilt for Longevity:\u003c\/h6\u003e\n\u003cp\u003eThis aluminum expansion tank cap is a simple yet effective upgrade that enhances durability while maintaining proper cooling system pressure—perfect for enthusiasts who want reliability without sacrificing OEM fitment.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"K2 Industries","offers":[{"title":"Red","offer_id":45809341432042,"sku":"1005009554257299-Red","price":49.99,"currency_code":"USD","in_stock":true},{"title":"Blue","offer_id":46057697476842,"sku":"1005009554257299-Blue","price":49.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0477\/0427\/7142\/files\/Se7425175e18c4b69ba8967fcb589c024G.webp?v=1776448901","url":"https:\/\/www.k2-industries.com\/products\/bevinsee-coolant-expansion-tank-cap-for-bmw-e46-e39-e36-323i-325i-328i-525i-528i-530i-535i-for-bmw-x3-e83-x5-e53-z4-e85-e86","provider":"K2 Industries","version":"1.0","type":"link"}