{"product_id":"sierra-18-3568-thermostat-kit-160f-replaces-mercruiser-99155t1-fits-5-7-mie-mx6-2l-mpi-454-horizon-mie-502-mag-mpi-closed-cooling-engines","title":"Sierra Thermostat Kit 18-3568, 160 Degree F, MerCruiser Closed Cooling 7.4L 454 V-8, Replaces Mercruiser 99155T1","description":"\u003cp\u003eThe Sierra 18-3568 Thermostat Kit is a complete replacement thermostat and seal set built for closed-cooling MerCruiser V-8 engines. It supplies a 160 degree F thermostat along with a matching seal, giving the cooling system the correct opening temperature to keep engine operating temperature in the proper range. Marine thermostats regulate coolant flow between the engine block and the heat exchanger, and using the correct temperature rating and a fresh seal at each replacement helps prevent leaks and overheating.\u003c\/p\u003e\u003cp\u003eThis kit is designed for MerCruiser 7.4L EFI MIE FWC 454 cid V-8 engines and is also compatible with GM V-6 and V-8 engines equipped with closed cooling. It is built to meet or exceed the performance of the original equipment part it replaces, and it is interchangeable with Mercruiser part number 99155T1, making it a straightforward replacement when the factory thermostat or seal fails or when performing routine cooling system maintenance. The kit ships complete with the thermostat and seal needed to complete the job in a single purchase, without having to source separate components.\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 18-3568\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Thermostat Kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermostat Temperature Rating:\u003c\/strong\u003e 160 degrees F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCooling System Type:\u003c\/strong\u003e Closed Cooling\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Components:\u003c\/strong\u003e Thermostat (18-3555), Thermostat Seal (18-1508)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.17 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282112783\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMerCruiser 7.4L EFI MIE FWC 454 cid V-8 (1996-1997), closed cooling\u003c\/li\u003e\n\u003cli\u003eGM V-6 \u0026amp; V-8 engines with closed cooling (1998 \u0026amp; newer)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercruiser 99155T1\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat temperature does the Sierra 18-3568 thermostat open at?\u003c\/strong\u003e The Sierra 18-3568 thermostat kit opens at 160 degrees F.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included in the Sierra 18-3568 thermostat kit?\u003c\/strong\u003e The kit contains a thermostat (part 18-3555) and a thermostat seal (part 18-1508), everything needed to complete the replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-3568 thermostat kit fit?\u003c\/strong\u003e It fits MerCruiser 7.4L EFI MIE FWC 454 cid V-8 engines (1996-1997) with closed cooling, as well as GM V-6 and V-8 engines with closed cooling (1998 and newer).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-3568 kit work with raw water or standard cooling systems?\u003c\/strong\u003e No, the Sierra 18-3568 is designed specifically for closed-cooling systems, not standard raw water cooling.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3568 interchangeable with any Mercruiser part number?\u003c\/strong\u003e Yes, the 18-3568 thermostat kit is interchangeable with Mercruiser 99155T1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-3568 thermostat kit weigh?\u003c\/strong\u003e It weighs 0.17 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3568 an OEM or aftermarket part?\u003c\/strong\u003e It is an aftermarket replacement kit that Sierra states meets or exceeds the performance of the original equipment part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need to replace the thermostat seal along with the thermostat?\u003c\/strong\u003e Yes, and the 18-3568 kit makes this easy since it already includes both the 18-3555 thermostat and the 18-1508 seal in one package.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC code for the Sierra 18-3568 thermostat kit?\u003c\/strong\u003e The UPC for the Sierra 18-3568 Thermostat Kit is 808282112783.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is the 18-3568 different from Sierra's 18-3647 thermostat kit?\u003c\/strong\u003e The 18-3568 is built for closed-cooling MerCruiser 7.4L EFI MIE FWC engines (1996-1997), while the 18-3647 covers the same 7.4L EFI MIE engine and years but for standard cooling instead of closed cooling.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-3568 kit fix an overheating MerCruiser engine?\u003c\/strong\u003e A stuck or incorrectly rated thermostat is a common cause of marine engine overheating, and installing the correctly rated 160 degree F Sierra 18-3568 kit with a new seal addresses that specific failure point on closed-cooling MerCruiser 454 V-8 engines.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988153774299,"sku":"SIE-18-3568","price":21.88,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3568_lg__38122.1558124605.500.750.jpg?v=1785188379","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-3568-thermostat-kit-160f-replaces-mercruiser-99155t1-fits-5-7-mie-mx6-2l-mpi-454-horizon-mie-502-mag-mpi-closed-cooling-engines","provider":"Good Vibes Marina","version":"1.0","type":"link"}