{"product_id":"febi-36737-radiator-cap","title":"Febi 36737 Radiator Cap","description":"\u003ch2\u003eFebi Radiator Cap for BMW Cooling Systems\u003c\/h2\u003e\u003cp\u003eThe Febi 36737 radiator cap is a direct-fit cooling system component for a wide range of BMW models from 2006-2021. Built from plastic with a 1.4 bar pressure rating, it helps maintain the correct pressure in the radiator or expansion tank system for stable engine cooling.\u003c\/p\u003e\u003cp\u003eFebi febi product line parts are built for European vehicle applications where exact thread, diameter, and pressure specifications matter. This radiator cap uses an M52 x 3 outside thread and an 88.0 mm filler neck outside diameter for the listed BMW fitments.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003ePart number: 36737\u003c\/li\u003e\n\u003cli\u003ePlastic construction\u003c\/li\u003e\n\u003cli\u003eYellow finish\u003c\/li\u003e\n\u003cli\u003eOutside thread: M52 x 3\u003c\/li\u003e\n\u003cli\u003eFiller neck outside diameter: 88.0 mm\u003c\/li\u003e\n\u003cli\u003ePressure rating: 1.4 bar\u003c\/li\u003e\n\u003cli\u003eArticle version: old implementation\u003c\/li\u003e\n\u003cli\u003eCross-reference: BMW 17 11 7 521 071, 17 11 7 639 020\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDetailed Product Information\u003c\/h2\u003e\u003cp\u003eUse this Febi radiator cap when replacing a worn, cracked, or pressure-weak cap on BMW cooling systems that require the M52 x 3 thread and 88 mm neck size. The 1.4 bar rating is important for maintaining system pressure, which supports proper coolant circulation and boiling-point control in the radiator and reservoir assembly. This is a practical replacement for BMW 440i, BMW X5, BMW X7, BMW 530i, BMW 740i, and other listed applications, and the Febi 36737 part number is useful when matching the correct service part.\u003c\/p\u003e\u003ch2\u003eCommon Problems This Part Can Address\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eCoolant loss from a cap that no longer seals properly\u003c\/li\u003e\n\u003cli\u003ePressure-related cooling system warnings\u003c\/li\u003e\n\u003cli\u003eVisible cracking or wear in the cap body\u003c\/li\u003e\n\u003cli\u003eIncorrect fitment from the wrong thread or neck diameter\u003c\/li\u003e\n\u003cli\u003eCooling system performance issues caused by a weak cap spring or seal\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eConfirm the filler neck outside diameter, outside thread specification, and pressure rating before installation. Inspect the sealing surface and surrounding reservoir or radiator neck for damage, contamination, or coolant residue. Install the cap only on BMW applications listed for this exact specification, including fitments such as BMW 330i, BMW 430i, BMW X3, BMW X4, and BMW 530e where the catalog data matches the same thread and pressure requirements.\u003c\/p\u003e\u003ch2\u003eQuality Assurance\u003c\/h2\u003e\u003cp\u003eFebi is a recognized aftermarket brand for European vehicle replacement parts, and this radiator cap is cataloged to match the specified BMW cooling system applications by thread, diameter, and pressure rating.\u003c\/p\u003e","brand":"Febi","offers":[{"title":"Default Title","offer_id":52409496862901,"sku":"CJBF-36737","price":17.36,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/FB_36737_Fro.jpg?v=1777780090","url":"https:\/\/www.partcatalog.com\/products\/febi-36737-radiator-cap","provider":"PartCatalog","version":"1.0","type":"link"}