{"product_id":"a-premium-aluminum-thermostat-housing-assembly-for-chevrolet-gmc-hummer-2004-2012-includes-thermostat-gasket","title":"A-Premium Aluminium Thermostat Housing Assembly for Chevrolet GMC Hummer (2004–2012) — Includes Thermostat \u0026 Gasket","description":"\u003cp\u003e\u003cstrong\u003eA-Premium's upgraded aluminum thermostat housing assembly is a complete replacement unit that includes the thermostat and gasket, designed to restore reliable engine temperature control on compatible Chevrolet, GMC and Hummer models.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eIf your vehicle is experiencing overheating, coolant leaks at the housing, or an unreliable temperature reading after years of service, this direct-fit assembly provides a durable alternative to aging plastic housings. Machined from aluminum and delivered with the thermostat and gasket installed, the unit replaces OEM part numbers 902-847, 12622316, 440180 and restores factory-style function without extensive modification.\u003c\/p\u003e\n\n\u003ch3\u003eHow will this housing assembly improve my vehicle's cooling system?\u003c\/h3\u003e\n\u003cp\u003eThe upgraded aluminum construction resists warping and cracking better than many OEM plastic housings, reducing leak risk and maintaining consistent coolant flow paths. Precise machining and a matched thermostat ensure predictable open\/close behavior for stable operating temperatures.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAluminum body reduces thermal expansion and deformation.\u003c\/li\u003e\n  \u003cli\u003eIncludes thermostat and gasket for immediate installation.\u003c\/li\u003e\n  \u003cli\u003eManufactured to fit OEM mounting points and coolant passages.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich vehicles and OEM references does it fit?\u003c\/h3\u003e\n\u003cp\u003eThis assembly is made to be compatible with specific GM midsize trucks and Hummer H3 models across 2004–2012 model years, replacing the listed OEM reference numbers for correct fitment. Always verify fitment against your vehicle's VIN or existing part number before purchase.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eChevrolet Colorado: 2004–2012 models.\u003c\/li\u003e\n  \u003cli\u003eGMC Canyon: 2004–2012 models.\u003c\/li\u003e\n  \u003cli\u003eHummer H3: 2007–2010 and H3T: 2009–2010 compatible.\u003c\/li\u003e\n  \u003cli\u003eReplaces OEM# 902-847, 12622316, 440180, 902847.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat should I know before installing this thermostat housing assembly?\u003c\/h3\u003e\n\u003cp\u003ePreparation and correct procedure help prevent damage and leaks. Clean the mounting surface and remove old gasket material and debris; inspect bolt holes and mating surfaces for damage. After installation, cycle the thermostat and check for leaks while the engine reaches normal operating temperature.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRemove all old gasket material; ensure screw holes are clean to avoid cracking.\u003c\/li\u003e\n  \u003cli\u003eFollow torque specifications for fasteners and use new gasket supplied.\u003c\/li\u003e\n  \u003cli\u003eRun the engine to operating temperature and inspect for coolant leaks and proper thermostat operation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat warranty and quality assurances does A-Premium provide?\u003c\/h3\u003e\n\u003cp\u003eA-Premium backs this assembly with a one-year unlimited-mileage guarantee and subjects parts to hardness and crush tests to verify structural integrity. The warranty covers manufacturing defects, giving added confidence after installation.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eOne-year unlimited-mileage warranty from A-Premium.\u003c\/li\u003e\n  \u003cli\u003eQuality control includes hardness and compression checks.\u003c\/li\u003e\n  \u003cli\u003eSupplied as a complete kit—housing, thermostat and gasket—for convenience.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: This aluminum thermostat housing assembly is aimed at owners and technicians working on Chevrolet Colorado and GMC Canyon trucks (2004–2012) or Hummer H3\/H3T models who want a stronger, longer-lasting replacement for worn or cracked plastic housings. It suits DIY mechanics replacing a leaking or failed housing, fleet maintenance shops seeking dependable OEM-fit parts, and anyone restoring cooling-system reliability without modifying original mounting points.\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 unit include the thermostat and gasket?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The assembly ships complete with the thermostat and gasket ready for installation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will this fit my 2008 GMC Canyon?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Likely yes for 2004–2012 GMC Canyon models; confirm by matching your OEM part number or VIN.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"A-Premium","offers":[{"title":"Default Title","offer_id":55165984932183,"sku":"B09YM9F7KK","price":35.09,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/a-premium-front-view-thermostat-housing_f0471195-0fc4-40ee-93a1-596d89dc6c5c.jpg?v=1790360565","url":"https:\/\/britishgarage.co.uk\/products\/a-premium-aluminum-thermostat-housing-assembly-for-chevrolet-gmc-hummer-2004-2012-includes-thermostat-gasket","provider":"British Garage","version":"1.0","type":"link"}