{"product_id":"bmw-radiator-expansion-tank-cap-coolant-reservoir","title":"BMW Radiator Expansion Tank Cap Coolant Reservoir Cap For 2006 To 2025 1 Series 3 Series 5 Series X Models Replacement Keep Your Engine Cool Prevent Leaks And Maintain Proper Pressure In The Cooling System","description":"\u003cdiv\u003eBMW Radiator Expansion Tank Cap, Single Replacement\n\u003cbr\u003e\n✔️ Direct, OEM-like fit for many BMWs; includes correct pressure sealing \u003cp\u003eThis radiator expansion tank cap is a sealing cap for the coolant reservoir, designed to regulate system pressure and prevent leaks in BMW cooling systems. It’s a common direct replacement for a wide range of models from 2006 to 2025, including 1 Series, 3 Series, 5 Series and X models.\u003c\/p\u003e \u003cp\u003e✅ Direct replacement part numbers: 17117639020, 17-11-7-639-020, 17117521071, 17-11-7-521-071 \u003cbr\u003e\n✅ Fits numerous BMW models from 2006-2025 across 1, 3, 5, X lines \u003cbr\u003e\n✅ Black aftermarket cap for durable, leak-resistant performance \u003cbr\u003e\n✅ Snap-on installation, no tools required for quick replacement \u003cbr\u003e\u003c\/p\u003e \u003cp\u003e💡 What is a radiator expansion tank cap and why should I replace it in my BMW cooling system?\u003c\/p\u003e\n- radiator cap maintains system pressure and prevents coolant leaks\n- replacement helps prevent overheating and air ingress in the cooling circuit\n- ensures reliable sealing to protect components like the water pump and hoses \u003c\/div\u003e","brand":"Amazon","offers":[{"title":"Default Title","offer_id":48111368863979,"sku":"VXB0F21CB5D5","price":49.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0662\/3268\/0683\/files\/61ibKajYIBL.jpg?v=1776511398","url":"https:\/\/vxb.com\/products\/bmw-radiator-expansion-tank-cap-coolant-reservoir","provider":"VXB Bearings","version":"1.0","type":"link"}