{"product_id":"genuine-audi-vw-expansion-tank-cap-4m0121321q","title":"Genuine Audi \u0026 VW Expansion Tank Cap 4M0121321Q","description":"\u003ch2\u003eShop Now Genuine Expansion Tank Cap Online – Part 4M0121321Q\u003c\/h2\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe genuine expansion tank cap 4M0121321Q for Audi and VW securely closes and seals the coolant reservoir. This cap maintains proper system pressure for efficient cooling. Your motor needs this to avoid overheating.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe cap threads onto the expansion tank opening securely. It creates a pressure seal that raises the coolant boiling point. Higher pressure prevents boiling even at high temperatures.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe internal spring and valve regulate the maximum system pressure. When pressure exceeds limits, the valve opens to release excess. This protects hoses and components from bursting.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eRubber sealing surfaces create tight contact with tank threads. The seal prevents coolant vapors from escaping. Worn seals allow pressure loss and coolant evaporation.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe cap also allows air to enter as the coolant contracts when cooling. This prevents vacuum formation that could collapse hoses. Proper venting keeps the system functioning correctly.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eYou receive the exact cap Audi and VW specified for your cooling system. It maintains the correct pressure rating for safe operation. Everything seals properly without leaks. Trust in Europeanautospares and order now.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e\u003cbr\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003ch2 dir=\"ltr\"\u003e\n\u003cspan\u003eSpecifications\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\n\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli dir=\"ltr\"\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e\u003cspan\u003e: Audi \u0026amp; VW\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\"\u003e\n\u003cspan\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/span\u003e\u003cspan\u003e: 4M0121321Q\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\"\u003e\n\u003cstrong\u003eType\u003c\/strong\u003e\u003cspan\u003e: Expansion Tank Cap (Coolant Reservoir Cap)\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\"\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003cspan\u003e: cap assembly with pressure valve\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\"\u003e\n\u003cstrong\u003eApplication\u003c\/strong\u003e\u003cspan\u003e: Cooling system\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\"\u003e\n\u003cstrong\u003eCondition\u003c\/strong\u003e\u003cspan\u003e: Brand New, Genuine \u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eWhy Choose European Auto Spares\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003ePressure Control:\u003c\/strong\u003e\u003cspan\u003e\u003cstrong\u003e \u003c\/strong\u003eThis cap maintains correct system pressure for efficient cooling.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eBoil Prevention:\u003c\/strong\u003e\u003cspan\u003e Raised pressure increases coolant boiling point significantly.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eTight Seal:\u003c\/strong\u003e\u003cspan\u003e Rubber surfaces prevent vapor escape and pressure loss.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eSafety Release:\u003c\/strong\u003e\u003cspan\u003e Valve opens to protect components from excessive pressure.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003eWorldwide Fast Shipping\u003c\/strong\u003e:\u003c\/span\u003e\u003cspan\u003e We deliver authentic components to you rapidly.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eNeed Help Finding the Right Audi \u0026amp; VW Part?\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eOur cooling specialists help you identify the correct cap for your vehicle. Contact Europeanautospares with your vehicle information for precise part verification today.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eWe confirm compatibility before processing your request. Your cap arrives in authentic packaging, ready to install. Professional assistance is available anytime you require it.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eKeep Your Audi \u0026amp; VW Cooling Sealed\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eFaulty caps lose pressure and allow coolant evaporation that causes overheating. Replace worn units with the Genuine Audi \u0026amp; VW Expansion Tank Cap 4M0121321Q now.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThis authentic cap restores proper pressure control to factory standards. Order today from Europeanautospares and maintain reliable cooling.\u003c\/span\u003e\u003c\/p\u003e","brand":"European Autospares Trading LLC","offers":[{"title":"Original \/ Audi \/ 4M0121321Q","offer_id":47870915051760,"sku":"4M0121321Q","price":162.0,"currency_code":"AED","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0775\/0546\/2512\/files\/European_Autospares_Logo...png?v=1774964489","url":"https:\/\/europeanautospares.com\/de\/products\/genuine-audi-vw-expansion-tank-cap-4m0121321q","provider":"European Autospares Trading LLC","version":"1.0","type":"link"}