{"title":"B9 Q5\/SQ5 Cooling","description":"\u003cp\u003eCooling parts for the Audi B9 Q5 and SQ5 3.0T. Vorsprung lists fitment on every product so you can match parts to your car.\u003c\/p\u003e","products":[{"product_id":"audi-3-0t-2-9t-billet-thermostat-housing-ea839","title":"Audi 3.0T\/2.9T Billet Thermostat Housing, EA839","description":"\u003ch3\u003eVorsprung Autowerk Billet Aluminum Thermostat Housing (EA839 3.0T\/2.9T)\u003c\/h3\u003e\n\u003cdiv style=\"background-color: #fef9c3; border: 1px solid #eab308; border-radius: 6px; padding: 12px 16px; margin: 12px 0;\"\u003e\n\u003cspan style=\"display: inline-block; background-color: #92400e; color: #ffffff; font-weight: bold; font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.5px; padding: 3px 10px; border-radius: 4px; margin-right: 8px; vertical-align: middle;\"\u003ePre-Order\u003c\/span\u003e\n\u003cspan style=\"color: #451a03; font-size: 0.9rem; vertical-align: middle;\"\u003eThis is a new listing. Orders are shipping in batches, with stock arriving late October to early November 2026. Order now to be first in line.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cb\u003eYour cooling system runs on a part made from a material that can't handle its own job.\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eThe turbocharged EA839 3.0T\/2.9T V6 in your B9 S4, S5, SQ5, RS5, C8 A6, A7, S6, S7, D5 A8, 4M Q7 or Q8 makes serious heat under boost. Audi's answer at the thermostat housing? A factory plastic unit sitting directly in the coolant loop, baking through heat cycle after heat cycle.\u003c\/p\u003e\n\u003cp\u003eOver time that plastic goes brittle. It cracks at the seams, warps around the sealing surface, and starts weeping coolant right when you can least afford to lose it. A slow leak turns into a coolant warning, a coolant warning turns into an overheat, and an overheat on a turbocharged engine is not a cheap mistake.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eThe Permanent Solution:\u003c\/b\u003e We don't replace a failed plastic part with another plastic part. The \u003cb\u003eVorsprung Autowerk Billet Thermostat Housing\u003c\/b\u003e is machined from 6061-T6 aluminum and engineered to outlast the factory unit, and the car, entirely. It closes the weak point in your cooling loop for good, whether your EA839 sees daily traffic or a track day.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eReady to Drop In:\u003c\/b\u003e Order it with the OEM Calorstat thermostat already installed and go straight from box to bay, or grab the billet-only housing if you're reusing your current thermostat.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWant the full story?\u003c\/strong\u003e Read our \u003ca href=\"\/blogs\/news\/audi-ea839-thermostat-housing-failure-guide\"\u003eAudi EA839 thermostat housing failure guide\u003c\/a\u003e for symptoms, cost comparisons, and install notes.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cp\u003e\u003cb\u003eMaterial:\u003c\/b\u003e 6061-T6 Billet Aluminum (no cracking, no warping, no more plastic in the loop).\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cb\u003eFinish:\u003c\/b\u003e Anodized for corrosion resistance and a cleaner engine bay.\u003c\/p\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eBillet Housing + OEM Calorstat Thermostat Includes:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eBillet Housing\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eOEM Calorstat Thermostat\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eOE Gaskets\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAll Hardware\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eNew Bolts\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eBillet Housing Only Includes:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eAll of the above except the thermostat\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eComplete Your Build:\u003c\/strong\u003e Pair this housing with our \u003ca href=\"\/products\/vorsprung-zeus-ignition-coil-upgrade-kit-audi-3-0-turbo-ea839\"\u003eZeus Ignition Coil Upgrade Kit\u003c\/a\u003e for stronger spark on the same EA839 platform, or our \u003ca href=\"\/products\/vorsprung-autowerk-4-bar-map-sensors-audi-b9-ea839\"\u003e4 Bar MAP Sensors\u003c\/a\u003e if you're already pushing more boost than stock.\u003c\/p\u003e\n\u003chr\u003e\n\u003cdiv class=\"product-fitment-section\" style=\"margin: 20px 0; font-family: inherit;\"\u003e\n\u003ch3 style=\"font-size: 1.1rem; margin-bottom: 10px; font-weight: bold;\"\u003eVehicle Fitment\u003c\/h3\u003e\n\u003cp\u003eThis housing replaces OEM part number 06M121115P (and the OEM thermostat, 06M121115N) across the EA839 3.0T\/2.9T turbocharged platform below.\u003c\/p\u003e\n\u003cdiv style=\"overflow-x: auto;\"\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; text-align: left; font-size: 0.95rem;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"border-bottom: 2px solid #ddd; background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #ddd;\"\u003eMake\u003c\/th\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #ddd;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #ddd;\"\u003eYears\u003c\/th\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #ddd;\"\u003eChassis\u003c\/th\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #ddd;\"\u003eEngine\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eAudi\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eS4\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2018–Present\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eB9 \/ B9.5\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e3.0T V6 Turbo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eAudi\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eS5\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2018–Present\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eB9 \/ B9.5\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e3.0T V6 Turbo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eAudi\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eSQ5\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2018–Present\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eB9 \/ B9.5\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e3.0T V6 Turbo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eAudi\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eA6, A7\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2019–Present\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eC8\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e3.0T V6 Turbo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eAudi\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eA8\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2018–Present\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eD5\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e3.0T V6 Turbo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eAudi\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eQ7\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2020–Present\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e4M.5\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e3.0T V6 Turbo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eAudi\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eQ8\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2019–Present\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e4M\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e3.0T V6 Turbo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eAudi\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eRS5\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2018–Present\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eB9 \/ B9.5\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2.9T V6 Twin-Turbo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eAudi\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eS6\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2020–Present\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eC8\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2.9T V6 Twin-Turbo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eAudi\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eS7\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2020–Present\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eC8\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2.9T V6 Twin-Turbo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp style=\"margin-top: 10px; font-size: 0.85rem; color: #555;\"\u003e\u003cem\u003e\u003cstrong\u003eNOTE:\u003c\/strong\u003e This is the newer turbocharged EA839 3.0T\/2.9T engine, distinct from the older supercharged EA837 3.0T. Check your engine code before ordering.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003chr\u003e\n\u003ch3\u003eThermostat Housing FAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhy does the factory plastic thermostat housing fail?\u003c\/strong\u003e\u003cbr\u003eAfter thousands of heat cycles and constant exposure to corrosive antifreeze, the factory plastic turns brittle, cracks, and warps, eventually weeping coolant and risking an overheat on a turbocharged engine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShould I get the full assembly or the billet-only housing?\u003c\/strong\u003e\u003cbr\u003eThe full assembly includes a billet housing pre-assembled with an OEM Calorstat thermostat, OE gaskets, all hardware, and new bolts. The billet-only housing includes everything except the thermostat, for anyone reusing a known-good factory unit.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this a direct bolt-on?\u003c\/strong\u003e\u003cbr\u003eYes. It comes pre-assembled and installs in place of the factory plastic housing with no modification required.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill this fit my supercharged EA837 S4\/S5?\u003c\/strong\u003e\u003cbr\u003eNo. This housing is for the newer turbocharged EA839 3.0T\/2.9T engine. If you have the older supercharged EA837 3.0T, check our separate EA837 billet thermostat housing listing instead.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo I need a tune after installing this?\u003c\/strong\u003e\u003cbr\u003eNo. This is a mechanical cooling system upgrade, not a tuning part, so no software changes are required.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhen will my order ship?\u003c\/strong\u003e\u003cbr\u003eThis is a pre-order listing. Orders are shipping in batches, with current stock arriving late October to early November 2026.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill this fit my Audi?\u003c\/strong\u003e\u003cbr\u003eCheck the Vehicle Fitment table above. It covers every EA839 3.0T and 2.9T Audi listed there. If your Audi isn't listed, email us at help@vorsprungautowerk.com before ordering.\u003c\/p\u003e\n\u003chr\u003e\n\u003cdiv style=\"background-color: #f8fafc; border: 1px solid #e2e8f0; border-radius: 8px; padding: 24px; margin: 30px 0;\"\u003e\n\u003ch3 style=\"font-size: 1.25rem; font-weight: bold; margin-top: 0; margin-bottom: 20px; text-transform: uppercase; letter-spacing: 0.5px; color: #0f172a;\"\u003eWhy Buy From Us?\u003c\/h3\u003e\n\u003cul style=\"list-style-type: none; padding: 0; margin: 0;\"\u003e\n\u003cli style=\"margin-bottom: 14px;\"\u003e✅ \u003cstrong style=\"color: #0f172a;\"\u003eEnthusiast Designed \u0026amp; Tested:\u003c\/strong\u003e Developed by people who actually drive and modify these cars.\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 14px;\"\u003e✅ \u003cstrong style=\"color: #0f172a;\"\u003eTested on Our Own Cars:\u003c\/strong\u003e If we wouldn't run it ourselves, we don't sell it.\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 14px;\"\u003e✅ \u003cstrong style=\"color: #0f172a;\"\u003eContinuous R\u0026amp;D:\u003c\/strong\u003e We continually develop and improve our products instead of relying on generic catalog parts.\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 14px;\"\u003e✅ \u003cstrong style=\"color: #0f172a;\"\u003eSupporting Audi Platform Development:\u003c\/strong\u003e Your purchase helps fund continued development of new parts for these chassis.\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 14px;\"\u003e✅ \u003cstrong style=\"color: #0f172a;\"\u003eReal Enthusiast Support:\u003c\/strong\u003e Get help from people who understand the platform, not ticket bots.\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 14px;\"\u003e✅ \u003cstrong style=\"color: #0f172a;\"\u003eSmall Team, Big Passion:\u003c\/strong\u003e Every order directly supports continued product development and innovation.\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 0;\"\u003e✅ \u003cstrong style=\"color: #0f172a;\"\u003ePerformance Without the Marketing Fluff:\u003c\/strong\u003e Purpose-built parts designed to perform.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003chr\u003e\n\u003cp style=\"text-align: center; font-weight: bold; margin-top: 30px;\"\u003eDrive the difference. Drive Vorsprung.\u003c\/p\u003e","brand":"Vorsprung Autowerk","offers":[{"title":"Billet Housing + OEM Calorstat Thermostat","offer_id":58552910840111,"sku":null,"price":224.99,"currency_code":"USD","in_stock":true},{"title":"Billet Housing","offer_id":58552910872879,"sku":null,"price":159.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0923\/5821\/3935\/files\/b41c95ad25fd656c868519f3a3718af2.png?v=1790606186"}],"url":"https:\/\/www.vorsprungautowerk.com\/collections\/audi-b9-q5-sq5-cooling.oembed","provider":"Vorsprung Autowerk","version":"1.0","type":"link"}