{"product_id":"coolant-overflow-reservoir","title":"Coolant Overflow Reservoir","description":"The Rein Automotive coolant expansion tank serves as a vital component of your BMW's cooling system. Also known as an overflow bottle, its primary function is to manage the expansion and contraction of engine coolant due to temperature changes. It safely captures excess coolant, maintains system pressure, and ensures the radiator is adequately supplied, preventing inefficiencies and potential damage.\n\nCrafted from 100% virgin plastic, this expansion tank is engineered to withstand continuous heat cycles, resisting premature cracking and coolant loss that can occur with age and exposure to extreme temperatures. The unit does not include the expansion tank cap or coolant level sensor, which must be sourced separately.\n\nSymptoms of a failing expansion tank can include foggy or opaque plastic, making it difficult to read the coolant level, and leaks, typically originating from seams or seals. A compromised tank can lead to a loss of cooling system pressure, reducing the coolant's boiling point and potentially causing engine overheating. Regular inspection and timely replacement are recommended, especially when installing a new radiator.\n\nThis Rein Automotive expansion tank is compatible with a range of BMW models including the 540i, 740i, 740iL, 750iL, 840Ci, 850Ci, 850CSi, and 850i.","brand":"Rein Automotive","offers":[{"title":"Default Title","offer_id":52689702027576,"sku":"17111741167.Rein","price":48.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0970\/4895\/3144\/files\/687728917.jpg?v=1784909379","url":"https:\/\/store.motormia.co\/products\/coolant-overflow-reservoir","provider":"MOTORMIA","version":"1.0","type":"link"}