{"product_id":"mitzone-aluminum-thermostat-housing-assembly-for-bmw-e46-e39-e60-e83-e53-e85-direct-fit-upgraded-metal","title":"MITZONE Aluminum Thermostat Housing Assembly for BMW E46\/E39\/E60\/E83\/E53\/E85 — Direct-Fit Upgraded Metal","description":"\u003cp\u003e\u003cstrong\u003eMITZONE’s upgraded aluminum thermostat assembly with integrated housing is a direct-fit replacement for BMW models listed and replaces part number 11537509227.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWhen a failing thermostat or cracked plastic housing causes overheating, coolant leaks, or erratic engine temperature, replacing the entire assembly with a durable metal unit restores reliable cooling system performance. This MITZONE part combines the thermostat, housing and gasket into a single assembly constructed from aluminum for improved heat resistance and longevity compared with original plastic housings. It’s designed to fit a wide range of BMW vehicles across the E46, E39, E60, E83, E53, E85 platforms and intended as a straightforward swap for mechanics and experienced DIYers.\u003c\/p\u003e\n\n\u003ch3\u003eWhich BMW models and years will this assembly fit?\u003c\/h3\u003e\n\u003cp\u003eThis thermostat assembly is built to match OEM mounting points and plumbing for many late-1990s through mid-2000s BMW models. Confirm fitment by cross-referencing the replacement number 11537509227 and your vehicle’s year and engine configuration before installation.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCommon compatible models: 323i, 323Ci, 325Ci, 325i, 325xi, 328Ci, 328i, 330Ci, 330i, 330xi, 525i, 528i, 530i\u003c\/li\u003e\n  \u003cli\u003eSUV and roadster fits include X3 (2004–2006), X5 (2001–2006), Z3 (1999–2002), Z4 (2003–2005)\u003c\/li\u003e\n  \u003cli\u003eDesigned to replace part number 11537509227 for direct-fit replacement\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does the aluminum housing improve reliability?\u003c\/h3\u003e\n\u003cp\u003eAluminum resists thermal cycling and pressure-related cracking better than many factory plastic housings, reducing the chance of coolant leaks and premature failure. The metal housing also disperses heat more evenly and maintains structural integrity under elevated engine bay temperatures.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMetal construction minimizes warping and stress fractures\u003c\/li\u003e\n  \u003cli\u003eBetter heat dissipation under high-load or hot-climate driving\u003c\/li\u003e\n  \u003cli\u003eLonger service life compared with common plastic housings\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat’s included and what should I expect during installation?\u003c\/h3\u003e\n\u003cp\u003eThis kit ships as a complete thermostat housing assembly with the thermostat unit and gasket pre-packed to simplify replacement. Installation typically involves draining coolant, removing the old housing, swapping the assembly, replacing coolant, and bleeding air from the cooling system; torque specs and hose clamp positions should follow BMW service guidance.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eComplete package: thermostat, aluminum housing, and gasket\u003c\/li\u003e\n  \u003cli\u003eDesigned for bolt-on installation where the OEM layout matches\u003c\/li\u003e\n  \u003cli\u003eRecommended: new coolant and proper system bleeding after install\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this part help prevent recurring cooling system issues?\u003c\/h3\u003e\n\u003cp\u003eReplacing both the thermostat and housing at once removes two common failure points and reduces the chance of needing another repair shortly afterward. While this upgrade improves durability, overall cooling system health also depends on hoses, water pump, radiator condition, and proper maintenance.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAddresses leaks and failures related to housing material fatigue\u003c\/li\u003e\n  \u003cli\u003eReplaces thermostat to restore correct operating temperature control\u003c\/li\u003e\n  \u003cli\u003eBest used alongside inspection of hoses, clamps, and coolant condition\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: Owners and technicians working on compatible BMW models who want a durable, direct-replacement thermostat assembly that reduces the likelihood of repeat repairs. It’s a practical upgrade for cars with aging plastic housings, vehicles used in hotter climates, or any project where long-term cooling system reliability is a priority. If you’re unsure about fitment, provide your VIN or vehicle year\/model to confirm compatibility before purchasing.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does this replace BMW part number 11537509227?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. This MITZONE assembly is designed as a direct replacement for BMW part number 11537509227.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is the housing metal or plastic?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: The housing is upgraded aluminum to improve heat resistance and reduce cracking compared with plastic housings.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"MITZONE","offers":[{"title":"Default Title","offer_id":48085882011806,"sku":"B09YRBZF19","price":49.98,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/mitzone-thermostat-assembly-front-view.jpg?v=1785879286","url":"https:\/\/northtrailauto.ca\/products\/mitzone-aluminum-thermostat-housing-assembly-for-bmw-e46-e39-e60-e83-e53-e85-direct-fit-upgraded-metal","provider":"North Trail Auto","version":"1.0","type":"link"}