{"product_id":"four-seasons-85991-engine-coolant-thermostat-housing","title":"Four Seasons 85991 Engine Coolant Thermostat Housing","description":"\u003ch2\u003eOverview of Four Seasons Thermostat Housing 85991\u003c\/h2\u003e\u003cp\u003eThe Four Seasons Thermostat Housing 85991 is designed for precise engine coolant regulation in select BMW models. This integrated thermostat housing includes the thermostat and is constructed from durable plastic to ensure reliable performance in your vehicle's cooling system.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eMaterial: High-quality plastic construction\u003c\/li\u003e\n\u003cli\u003eIncludes integrated thermostat for streamlined installation\u003c\/li\u003e\n\u003cli\u003eBolt hole center-to-center distance: 1.565 inches\u003c\/li\u003e\n\u003cli\u003eInlet port diameter: 1.536 inches\u003c\/li\u003e\n\u003cli\u003eFlange thickness: 0.408 inches\u003c\/li\u003e\n\u003cli\u003eOverall height: 5.5 inches\u003c\/li\u003e\n\u003cli\u003eCompatible with multiple BMW models including 228i, 320i, 328i, 428i, 528i, X1, X3, X5, and Z4\u003c\/li\u003e\n\u003cli\u003eMeets or exceeds OEM specifications\u003c\/li\u003e\n\u003cli\u003eGasket or seal not included\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eAbout the Four Seasons Thermostat Housing Product Line\u003c\/h2\u003e\u003cp\u003eThe Four Seasons Thermostat Housing product line focuses on engine coolant components designed to meet or exceed original equipment manufacturer standards. This line provides integrated thermostat housings that simplify replacement and maintenance by combining the thermostat and housing into a single unit. The 85991 part number is part of this line, offering compatibility with a range of BMW vehicles and engineered for precise fit and function.\u003c\/p\u003e\u003ch2\u003eDetailed Product Description\u003c\/h2\u003e\u003cp\u003eThe Four Seasons Thermostat Housing 85991 is an integrated thermostat housing made from durable plastic, engineered to maintain optimal engine temperature by regulating coolant flow. The housing features a bolt hole center-to-center measurement of 1.565 inches and an inlet port diameter of 1.536 inches, ensuring a precise fit for compatible BMW models. With a flange thickness of 0.408 inches and an overall height of 5.5 inches, this component is designed to match OEM specifications closely. The integrated thermostat included with this housing streamlines installation and reduces the need for additional parts, although a gasket or seal is not included and should be sourced separately.\u003c\/p\u003e\u003ch2\u003eCommon Applications and Issues Addressed\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eReplacement for faulty or leaking thermostat housings in BMW 228i, 320i, 328i, 428i, 528i, X1, X3, X5, and Z4 models\u003c\/li\u003e\n\u003cli\u003eResolves engine overheating caused by thermostat failure\u003c\/li\u003e\n\u003cli\u003ePrevents coolant leaks due to cracked or damaged housing\u003c\/li\u003e\n\u003cli\u003eRestores proper coolant flow and engine temperature regulation\u003c\/li\u003e\n\u003cli\u003eAddresses issues related to thermostat sticking or malfunctioning\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eEnsure the engine is cool before beginning installation to avoid burns\u003c\/li\u003e\n\u003cli\u003eRemove the old thermostat housing carefully to prevent damage to surrounding components\u003c\/li\u003e\n\u003cli\u003eUse a new gasket or seal as this part does not include one\u003c\/li\u003e\n\u003cli\u003eTorque bolts to manufacturer specifications to avoid leaks or damage\u003c\/li\u003e\n\u003cli\u003eCheck coolant levels and refill as necessary after installation\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eQuality Assurance and Warranty\u003c\/h2\u003e\u003cp\u003eThe Four Seasons Thermostat Housing 85991 meets or exceeds OEM standards for fit, form, and function. Manufactured with quality materials and precision engineering, this part is designed to provide reliable service in your BMW vehicle. While specific warranty details are not provided, Four Seasons products typically come with a limited warranty against defects in material and workmanship. Consult product documentation or the manufacturer for exact warranty terms.\u003c\/p\u003e","brand":"Four Seasons","offers":[{"title":"Default Title","offer_id":44617457729717,"sku":"BBRN-85991","price":108.57,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/FS_85991_Fro_0fc6a156-5ef1-4c4d-bbc3-f01464a30d90.jpg?v=1775070772","url":"https:\/\/www.partcatalog.com\/products\/four-seasons-85991-engine-coolant-thermostat-housing","provider":"PartCatalog","version":"1.0","type":"link"}