{"product_id":"sierra-18-3619-thermostat-kit-145-degrees-f-volvo-penta-i-o-fresh-water-cooled-cooling-system","title":"Sierra 18-3619 Thermostat Kit for Fresh Water Cooled Marine Engines","description":"\u003cp\u003eThe Sierra 18-3619 is a complete thermostat kit built for fresh water cooled marine engines, replacing a worn or stuck thermostat so the engine holds a stable, correct operating temperature. A fresh water cooled engine relies on the thermostat to regulate coolant flow through the closed cooling loop, and a failed unit can cause overheating, poor fuel efficiency, or an engine that never reaches proper operating temperature. This kit gives boat owners and marine technicians a straightforward, engineered replacement rather than sourcing individual pieces separately.\u003c\/p\u003e\u003cp\u003eThe thermostat features a machined exterior for a precise, consistent fit in the housing it is installed into. Sierra builds this kit to meet or exceed the performance of the original equipment part it replaces, so installation and operation match what the engine was originally designed around. Its compact dimensions keep it a close match for the factory thermostat cavity, and the kit is sized for engines using a fresh water cooling arrangement rather than raw water cooling.\u003c\/p\u003e\u003cp\u003eThis part is commonly used on Volvo Penta engines within the fresh water cooling category, and is intended as a direct maintenance replacement during routine cooling system service or when diagnosing overheating issues.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-3619\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Thermostat Kit, Fresh Water Cooled\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCooling System Type:\u003c\/strong\u003e Fresh Water Cooled\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282270605\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.17 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 0.39 x 0.39 x 0.39 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExterior Finish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Application:\u003c\/strong\u003e Volvo Penta fresh water cooled engines\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eDesigned for Volvo Penta fresh water cooled marine engines.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cp\u003eNo OEM cross-reference numbers are listed for this part.\u003c\/p\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines is the Sierra 18-3619 thermostat kit designed for?\u003c\/strong\u003e The Sierra 18-3619 thermostat kit is designed for Volvo Penta fresh water cooled marine engines, where it regulates coolant temperature within the closed cooling loop.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a fresh water cooled or raw water cooled thermostat?\u003c\/strong\u003e It is a fresh water cooled thermostat kit, meaning it is built for engines that use a closed, fresh water cooling loop rather than drawing raw water directly through the block.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-3619 thermostat kit weigh?\u003c\/strong\u003e The Sierra 18-3619 weighs 0.17 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the Sierra 18-3619 thermostat?\u003c\/strong\u003e The thermostat measures 0.39 x 0.39 x 0.39 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat finish does the Sierra 18-3619 thermostat have?\u003c\/strong\u003e It has a machined exterior finish for a precise fit in the thermostat housing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-3619 kit meet OEM performance standards?\u003c\/strong\u003e Sierra builds the 18-3619 thermostat kit to meet or exceed the performance of the original equipment part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat signs indicate my thermostat needs replacing with the 18-3619 kit?\u003c\/strong\u003e Engine overheating, an engine that runs consistently cool, or fluctuating temperature gauge readings are common signs a fresh water cooled engine's thermostat, such as the Sierra 18-3619, needs replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs installation of the 18-3619 thermostat kit something a boat owner can do themselves?\u003c\/strong\u003e The Sierra 18-3619 is a direct maintenance replacement thermostat kit, sized to match the factory thermostat cavity, making it suitable for routine cooling system service by an owner comfortable with basic engine maintenance or a marine technician.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included in the Sierra 18-3619 thermostat kit?\u003c\/strong\u003e The 18-3619 is sold as a complete thermostat kit rather than a bare thermostat alone, giving you the components needed for the replacement in one package.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3619 a genuine Sierra part or aftermarket?\u003c\/strong\u003e The 18-3619 is manufactured by Sierra as a direct replacement part, engineered to meet or exceed the original equipment component it replaces on applicable Volvo Penta fresh water cooled engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-3619 thermostat kit?\u003c\/strong\u003e The UPC for the Sierra 18-3619 Thermostat Kit - Fresh Water Cooled is 808282270605.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988155314395,"sku":"SIE-18-3619","price":43.07,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3619__66591.1662729898.500.750.jpg?v=1785188603","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-3619-thermostat-kit-145-degrees-f-volvo-penta-i-o-fresh-water-cooled-cooling-system","provider":"Good Vibes Marina","version":"1.0","type":"link"}