{"product_id":"bmw-expansion-tank-return-hose-replacement-coolant-reservoir-to-water-pipe-hose-e46-320i-323i-325i-328i-330i-11531436410","title":"BMW Expansion Tank Return Hose – OEM Cooling System Replacement, Connects Coolant Reservoir to Water Pipe for E46 320i, 323i, 325i, 328i \u0026 330i Models | Replaces Part No. 11531436410","description":"\u003cp class=\"p1\"\u003e\u003cstrong\u003eRestore proper coolant circulation and cooling system reliability with this OEM-style Expansion Tank Return Hose replacement for BMW E46 models. Designed to connect the coolant expansion tank to the cooling system water pipe, this hose plays an important role in maintaining coolant flow, regulating system pressure, and supporting proper engine temperature management.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eOver time, coolant hoses are exposed to constant heat cycles, pressure fluctuations, and long-term coolant contact, which can cause the rubber material to harden, swell, crack, or deteriorate. Once the return hose begins to fail, coolant leaks, pressure loss, overheating concerns, and reduced cooling system performance can follow. Replacing worn hoses before they fail is an important preventative maintenance step that helps protect the engine and cooling system from more costly repairs.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eManufactured from durable automotive-grade materials, this replacement coolant hose is built to withstand demanding engine bay temperatures while maintaining flexibility and long-term reliability. The precision-molded construction helps ensure OEM-style fitment and secure connections for dependable, leak-resistant performance.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eWhether you are repairing a coolant leak, replacing an aging hose, or refreshing the cooling system as a whole, this direct-fit replacement helps restore factory cooling performance and long-term reliability without requiring modifications.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"p1\"\u003eDirect OEM Replacement: Designed to replace the factory expansion tank return hose on compatible BMW E46 applications.\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eConnects Expansion Tank to Coolant Water Pipe: Maintains proper coolant routing through a critical part of the cooling system.\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eRestores Proper Coolant Circulation and System Pressure: Helps support stable cooling system function and dependable temperature control.\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eHelps Prevent Coolant Leaks and Overheating: Replacing a worn hose can help reduce the risk of coolant loss and temperature-related engine issues.\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eMaintains Cooling System Efficiency and Reliability: Supports long-term cooling system performance under normal and demanding driving conditions.\u003c\/li\u003e\n\u003cli class=\"p1\"\u003ePrecision-Molded OEM-Style Fitment: Designed to match the original routing and installation layout for secure, leak-resistant connections.\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eDurable Heat-Resistant Rubber Construction: Built for long service life in demanding engine bay conditions.\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eIdeal for Repairs and Preventative Maintenance: A smart replacement when refreshing aging E46 cooling system components.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eFITMENT:\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"p1\"\u003eBMW 3 Series – E46 Sedan, Coupe, Touring, Convertible\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p1\"\u003eCompatible with:\u003cbr\u003e320i Sedan (2001–2005)\u003cbr\u003e323Ci Coupe \/ Convertible (2000)\u003cbr\u003e323i Sedan \/ Touring (1999–2000)\u003cbr\u003e325Ci Coupe \/ Convertible (2001–2006)\u003cbr\u003e325i Sedan \/ Touring (2001–2005)\u003cbr\u003e325xi Sedan \/ Touring (2001–2005)\u003cbr\u003e328Ci Coupe (2000)\u003cbr\u003e328i Sedan (1999–2000)\u003cbr\u003e330Ci Coupe \/ Convertible (2001–2006)\u003cbr\u003e330i Sedan \/ Touring (2001–2005)\u003cbr\u003e330xi Sedan \/ Touring (2001–2005)\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eEngine compatibility:\u003cbr\u003eM52TU inline-6\u003cbr\u003eM54 inline-6\u003cbr\u003eM56 inline-6\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eIf you’re unsure whether this expansion tank return hose fits your specific vehicle, please contact us with your VIN and we’ll be happy to verify compatibility before you order.\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e\u003cb\u003eReplaces Part No.\u003c\/b\u003e\u003cspan class=\"s2\"\u003e 11531436410\u003cbr\u003e\u003c\/span\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eBMW Reference:\u003c\/b\u003e\u003c\/span\u003e\u003cspan class=\"s2\"\u003e 11-53-1-436-410\u003c\/span\u003e\u003c\/p\u003e","brand":"BAVMODS®","offers":[{"title":"Default Title","offer_id":47618491777214,"sku":null,"price":51.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0619\/8788\/1150\/files\/S08a507e0393b467ba85158ef783ce5aaB.jpg_960x960q75.jpg__1.avif?v=1781076389","url":"https:\/\/bavmods.com\/de\/products\/bmw-expansion-tank-return-hose-replacement-coolant-reservoir-to-water-pipe-hose-e46-320i-323i-325i-328i-330i-11531436410","provider":"BAVMODS®","version":"1.0","type":"link"}