{"product_id":"four-seasons-74804-hvac-heater-control-valve","title":"Four Seasons 74804 HVAC Heater Control Valve","description":"\u003ch2\u003eOverview of Four Seasons Heater Valve 74804\u003c\/h2\u003e\u003cp\u003eThe Four Seasons Heater Valve 74804 is designed to regulate the flow of coolant in your vehicle's heating system. Specifically engineered for Cadillac Eldorado and Seville models, this HVAC heater control valve ensures precise temperature control by vacuum operation.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eOEM replacement part number 74804\u003c\/li\u003e\n\u003cli\u003eVacuum-operated non-bypass heater valve\u003c\/li\u003e\n\u003cli\u003eConstructed from durable plastic material\u003c\/li\u003e\n\u003cli\u003eEquipped with three hose connectors for secure fitment\u003c\/li\u003e\n\u003cli\u003eCompatible with Cadillac Eldorado and Seville models\u003c\/li\u003e\n\u003cli\u003eStandard opening sizes: 0.750 inch (19.05 mm) and 0.625 inch (15.875 mm)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDetailed Product Description\u003c\/h2\u003e\u003cp\u003eThe Four Seasons Heater Valve 74804 belongs to the Heater Valve product line, which focuses on reliable HVAC temperature control components. This particular valve operates using vacuum pressure to close the non-bypass heater valve, effectively controlling coolant flow to the heater core. Made from plastic, it features three hose connectors with precise opening dimensions—0.750 inch (19.05 mm) for openings B, C, and the main opening, and 0.625 inch (15.875 mm) for opening D—ensuring compatibility with the original equipment specifications. This part is an exact OEM replacement, designed to maintain the factory performance of your Cadillac Eldorado or Seville heating system.\u003c\/p\u003e\u003ch2\u003eCommon Applications and Issues Addressed\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eRestores proper heater core coolant flow control\u003c\/li\u003e\n\u003cli\u003eResolves heater valve leaks or failures\u003c\/li\u003e\n\u003cli\u003eEliminates inconsistent cabin heating problems\u003c\/li\u003e\n\u003cli\u003ePrevents vacuum-related heater valve malfunctions\u003c\/li\u003e\n\u003cli\u003eReplaces worn or damaged original heater valves\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eEnsure vacuum lines are properly connected to maintain valve operation\u003c\/li\u003e\n\u003cli\u003eVerify hose connector sizes match original equipment for a secure fit\u003c\/li\u003e\n\u003cli\u003eInspect surrounding HVAC components for wear during installation\u003c\/li\u003e\n\u003cli\u003eFollow vehicle-specific service manual instructions for removal and installation\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eQuality Assurance and Warranty\u003c\/h2\u003e\u003cp\u003eFour Seasons provides this heater valve as a direct OEM replacement, meeting original equipment standards for fit, form, and function. Manufactured with quality plastic materials and tested for vacuum operation reliability, part number 74804 is backed by Four Seasons' commitment to durability and performance. Please refer to Four Seasons' warranty policy for specific coverage details.\u003c\/p\u003e","brand":"Four Seasons","offers":[{"title":"Default Title","offer_id":44611135996085,"sku":"BBRN-74804","price":30.32,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/FS_74804_Fro.jpg?v=1775070028","url":"https:\/\/www.partcatalog.com\/products\/four-seasons-74804-hvac-heater-control-valve","provider":"PartCatalog","version":"1.0","type":"link"}