{"product_id":"sierra-18-3539-marine-thermostat-kit-160f-replaces-volvo-penta-3831426-closed-cooling-system-includes-sealing-ring","title":"Sierra 18-3539 140 Degree Thermostat Kit for Closed Cooling Systems, Replaces 875779","description":"\u003cp\u003eThe Sierra 18-3539 is a 140 degree thermostat kit built for closed cooling systems, supplying a marine engine's cooling circuit with a factory-style thermostat that opens at the correct temperature to keep the engine running in its proper operating range. Running an engine without the correct thermostat, or with a unit that has failed open or closed, can lead to overheating or the engine never reaching efficient operating temperature, so replacing a worn or incorrect thermostat with the properly rated 140 degree unit is a routine but important part of closed cooling system maintenance.\u003c\/p\u003e\u003cp\u003eThis kit includes the sealing ring needed for installation, so the thermostat housing can be resealed at the same time the thermostat itself is replaced, reducing the chance of a coolant leak from an old or hardened gasket surface. The 18-3539 is designed as a direct replacement for engines that originally used a 140 degree thermostat in a closed cooling configuration.\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 18-3539\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Thermostat Kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Rating:\u003c\/strong\u003e 140 degrees\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Type:\u003c\/strong\u003e Closed Cooling System\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e Sealing ring\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 2.75 x 3.63 x 2.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.2 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282265854\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eDesigned for closed cooling systems specifying a 140 degree thermostat\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e875779\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat temperature does the Sierra 18-3539 thermostat open at?\u003c\/strong\u003e The Sierra 18-3539 is rated at 140 degrees, meaning it opens at that temperature to regulate coolant flow in a closed cooling system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this kit include the sealing ring?\u003c\/strong\u003e Yes, the 18-3539 thermostat kit includes the sealing ring needed to reseal the thermostat housing during installation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the Sierra 18-3539 replace?\u003c\/strong\u003e The 18-3539 replaces OEM part number 875779.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-3539 a complete kit or just the thermostat?\u003c\/strong\u003e It is a complete kit consisting of the 140 degree thermostat and a sealing ring, not just the thermostat alone.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat type of cooling system is the 18-3539 designed for?\u003c\/strong\u003e This thermostat kit is designed for closed cooling systems, where the correct 140 degree thermostat is required for proper temperature regulation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-3539 thermostat kit weigh?\u003c\/strong\u003e The Sierra 18-3539 weighs 0.2 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-3539 thermostat kit?\u003c\/strong\u003e The kit measures 2.75 x 3.63 x 2.5 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3539 a genuine aftermarket replacement part?\u003c\/strong\u003e Yes, the 18-3539 is manufactured by Sierra as a direct replacement thermostat kit, cross-referenced to OEM number 875779.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy does my engine need the correct thermostat temperature rating?\u003c\/strong\u003e Installing a thermostat with the wrong temperature rating, instead of the 140 degree unit specified for the 18-3539 application, can cause the engine to overheat or run below its proper operating temperature.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-3539 thermostat kit?\u003c\/strong\u003e The UPC for the Sierra 18-3539 thermostat kit is 808282265854.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988150923483,"sku":"SIE-18-3539","price":46.19,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3539_lg__11883.1558126069.500.750.jpg?v=1785189178","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-3539-marine-thermostat-kit-160f-replaces-volvo-penta-3831426-closed-cooling-system-includes-sealing-ring","provider":"Good Vibes Marina","version":"1.0","type":"link"}