{"product_id":"dorman-902-991-engine-coolant-thermostat-housing","title":"Dorman 902-991 Engine Coolant Thermostat Housing - Engine Block","description":"\u003ch2\u003eOverview of Dorman Engine Coolant Thermostat Housing 902-991\u003c\/h2\u003e\u003cp\u003eThe Dorman 902-991 engine coolant thermostat housing is designed for reliable cooling system performance in select Audi and Volkswagen models. Constructed from durable black plastic, this thermostat housing ensures proper coolant flow and temperature regulation for your vehicle.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eMaterial: High-quality black plastic for corrosion resistance\u003c\/li\u003e\n\u003cli\u003eIncludes gasket and O-rings for secure sealing\u003c\/li\u003e\n\u003cli\u003eTwo mounting holes with 0.313-inch diameter for precise fitment\u003c\/li\u003e\n\u003cli\u003eHousing neck angled at 45 degrees from base for optimal coolant routing\u003c\/li\u003e\n\u003cli\u003eCompatible with Audi A4, A4 Quattro, A6, A6 Quattro, and Volkswagen Passat\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDetailed Product Description\u003c\/h2\u003e\u003cp\u003eThe Dorman 902-991 engine coolant thermostat housing is engineered to meet the specifications of your Audi or Volkswagen cooling system. Made from durable plastic, it resists corrosion and heat damage commonly found in engine compartments. The housing includes a gasket and O-rings to ensure a tight seal, preventing coolant leaks and maintaining system pressure. With two mounting holes sized at 0.313 inches in diameter, installation aligns accurately with factory mounting points. The 45-degree neck angle facilitates proper coolant flow direction, supporting efficient engine temperature control. This housing does not include a thermostat or bolts, allowing for compatibility with existing components.\u003c\/p\u003e\u003ch2\u003eCompatible Vehicles and Applications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eDesigned specifically for Audi A4 and A4 Quattro models\u003c\/li\u003e\n\u003cli\u003eFits Audi A6 and A6 Quattro vehicles\u003c\/li\u003e\n\u003cli\u003eCompatible with Volkswagen Passat models requiring this thermostat housing\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCommon Issues Addressed by This Thermostat Housing\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003ePrevents coolant leaks caused by cracked or damaged housings\u003c\/li\u003e\n\u003cli\u003eEliminates overheating due to improper coolant flow\u003c\/li\u003e\n\u003cli\u003eResolves coolant contamination from failed seals\u003c\/li\u003e\n\u003cli\u003eReplaces warped or deteriorated plastic housings\u003c\/li\u003e\n\u003cli\u003eSupports stable engine temperature regulation for improved performance\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eEnsure the engine is cool before beginning installation to avoid injury from hot coolant. Remove the old thermostat housing carefully, inspecting the mounting surface for debris or damage. Replace the gasket and O-rings included with the Dorman 902-991 to maintain a proper seal. Torque mounting bolts to manufacturer specifications (bolts not included). Verify the 45-degree neck angle aligns with existing coolant hoses for proper fitment. After installation, refill the cooling system and bleed air as necessary to prevent overheating.\u003c\/p\u003e\u003ch2\u003eQuality Assurance and Warranty\u003c\/h2\u003e\u003cp\u003eDorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The 902-991 thermostat housing undergoes quality inspections to ensure durability and performance. This part includes a gasket and O-rings to support leak-free operation. While bolts and thermostat are not included, the housing is designed for compatibility with factory components. Please refer to Dorman's warranty policy for specific coverage details.\u003c\/p\u003e","brand":"Dorman","offers":[{"title":"Default Title","offer_id":44327286014133,"sku":"BKKY-902-991","price":21.92,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/RB_902991_Fro_e6d1529a-e178-432b-a2ba-554a0c0dbd72.jpg?v=1775011737","url":"https:\/\/www.partcatalog.com\/products\/dorman-902-991-engine-coolant-thermostat-housing","provider":"PartCatalog","version":"1.0","type":"link"}