{"product_id":"kako-thermostat-housing-assembly-for-bmw-e46-e39-x5-x3-z3-z4-1999-2006-direct-fit-reinforced-seal","title":"KAKO Thermostat \u0026 Housing Assembly for BMW E46 E39 X5 X3 Z3 Z4 (1999–2006) — Direct-Fit, Reinforced Seal","description":"\u003cp\u003e\u003cstrong\u003eKAKO's thermostat and housing assembly is a direct-fit cooling control unit designed to restore correct engine temperature regulation on compatible BMWs from 1999–2006.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eIf your BMW is exhibiting temperature swings, an illuminated check-engine light related to cooling, or symptoms of coolant leakage from the thermostat area, this KAKO assembly replaces the factory thermostat and housing as a like-for-like solution. Built from reinforced materials for improved sealing and longevity, the unit fits multiple M54\/M52 engines and plugs into the original mounting points for straightforward installation.\u003c\/p\u003e\n\n\u003ch3\u003eWhich BMW models will this thermostat replace?\u003c\/h3\u003e\n\u003cp\u003eThis KAKO assembly covers a wide range of late‑1990s to mid‑2000s BMWs across sedans, coupes, SUVs, and roadsters. Check the engine size and year match before ordering to ensure compatibility.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFits E46: 323i\/323Ci\/325Ci\/325i\/325xi\/328i\/328Ci\/330Ci\/330i\/330xi (1999–2006 where specified)\u003c\/li\u003e\n  \u003cli\u003eFits E39: 525i\/528i\/530i (1999–2005 models listed)\u003c\/li\u003e\n  \u003cli\u003eFits SUVs \u0026amp; Z models: X3 (2004–2006), X5 (2001–2006), Z3\/Z4 roadsters (1999–2005)\u003c\/li\u003e\n  \u003cli\u003eMatches OEM part numbers: 11531437040, 11531436823, 11537509227, 11530139877\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does this assembly improve cooling system performance?\u003c\/h3\u003e\n\u003cp\u003eThe thermostat element opens and closes to regulate coolant flow based on engine load and temperature. KAKO’s housing uses higher-tolerance materials and improved gaskets to minimize leaks and provide stable thermal control over repeated heat cycles.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAccurate temperature regulation reduces overheating and overcooling events\u003c\/li\u003e\n  \u003cli\u003eHigher-quality housing material resists warping and gasket failure\u003c\/li\u003e\n  \u003cli\u003eDirect-mount design preserves original coolant routing and sensor locations\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat are the installation and fitment details I should know?\u003c\/h3\u003e\n\u003cp\u003eDesigned as a direct replacement, the assembly bolts into the original location and retains sensor ports for plug-and-play swap. Basic mechanical skills and common tools are sufficient; always follow vehicle-specific torque values and replace coolant when reassembling.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDirect OEM replacement—no modification needed\u003c\/li\u003e\n  \u003cli\u003eHigh-sealing flange and included gasket area (verify gasket included in package)\u003c\/li\u003e\n  \u003cli\u003eRecommended to drain coolant and bleed system after installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this part resolve check-engine lights and coolant leaks?\u003c\/h3\u003e\n\u003cp\u003eIf the error codes or symptoms point to thermostat failure or a leaking housing, replacing the thermostat and housing assembly often clears temperature-related fault codes and stops coolant seepage from the thermostat area. Diagnostics are recommended to confirm the thermostat is the root cause.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAddresses thermostat‑related temperature control faults\u003c\/li\u003e\n  \u003cli\u003ePrevents leaks when original housing has cracked or gasketed failings\u003c\/li\u003e\n  \u003cli\u003eHelps stabilize engine operation linked to coolant temperature sensors\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho this is for: This KAKO thermostat and housing assembly is intended for DIY mechanics, independent shops, and BMW owners who need a reliable, cost-effective replacement for original thermostat housings on E46, E39, X3, X5, Z3 and Z4 models produced between 1999 and 2006. Confirm your vehicle’s year, engine displacement, and OEM part number compatibility before purchase. For any fitment or installation questions, contact KAKO support and consult the vehicle repair manual for torque specs and coolant handling procedures.\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 KAKO thermostat match BMW OEM part numbers?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. It replaces OEM numbers 11531437040, 11531436823, 11537509227 and 11530139877.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I install this myself at home?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes—basic tools and coolant draining\/bleeding knowledge are required; follow factory torque specs and safety precautions.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"KAKO","offers":[{"title":"Default Title","offer_id":48085904654494,"sku":"B087WN95HS","price":45.48,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/kako-thermostat-front-assembly.jpg?v=1785880287","url":"https:\/\/northtrailauto.ca\/products\/kako-thermostat-housing-assembly-for-bmw-e46-e39-x5-x3-z3-z4-1999-2006-direct-fit-reinforced-seal","provider":"North Trail Auto","version":"1.0","type":"link"}