{"product_id":"sierra-18-3552-thermostat-mercury-mercruiser","title":"Sierra 18-3552 Thermostat – Mercury MerCruiser Replacement","description":"\u003cp data-end=\"391\" data-start=\"190\"\u003eThe \u003cstrong data-end=\"223\" data-start=\"194\"\u003eSierra 18-3552 Thermostat\u003c\/strong\u003e is a high-quality aftermarket replacement designed for Mercury MerCruiser engines, providing reliable temperature regulation and consistent cooling system performance.\u003c\/p\u003e\n\u003cp data-end=\"706\" data-start=\"393\"\u003eEngineered to meet or exceed OEM specifications, this thermostat ensures proper engine warm-up and maintains optimal operating temperature, helping prevent overheating and improve fuel efficiency. Built with marine-grade materials, it delivers dependable performance in both freshwater and saltwater environments.\u003c\/p\u003e\n\u003chr data-end=\"711\" data-start=\"708\"\u003e\n\u003ch2 data-end=\"732\" data-start=\"713\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-end=\"732\" data-start=\"716\"\u003eKey Features\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-end=\"958\" data-start=\"733\"\u003e\n\u003cli data-end=\"775\" data-start=\"733\"\u003eSierra premium aftermarket replacement\u003c\/li\u003e\n\u003cli data-end=\"815\" data-start=\"776\"\u003eMeets or exceeds OEM specifications\u003c\/li\u003e\n\u003cli data-end=\"865\" data-start=\"816\"\u003eMaintains proper engine operating temperature\u003c\/li\u003e\n\u003cli data-end=\"914\" data-start=\"866\"\u003eEnsures efficient cooling system performance\u003c\/li\u003e\n\u003cli data-end=\"958\" data-start=\"915\"\u003eCorrosion-resistant marine construction\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-end=\"963\" data-start=\"960\"\u003e\n\u003ch2 data-end=\"992\" data-start=\"965\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-end=\"992\" data-start=\"968\"\u003eEngine Compatibility\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003ch3 data-end=\"1028\" data-start=\"994\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-end=\"1028\" data-start=\"998\"\u003eMercury MerCruiser Engines\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp data-end=\"1046\" data-start=\"1029\"\u003eCommonly used on:\u003c\/p\u003e\n\u003cul data-end=\"1106\" data-start=\"1047\"\u003e\n\u003cli data-end=\"1066\" data-start=\"1047\"\u003e4.3L V6 engines\u003c\/li\u003e\n\u003cli data-end=\"1086\" data-start=\"1067\"\u003e5.0L V8 engines\u003c\/li\u003e\n\u003cli data-end=\"1106\" data-start=\"1087\"\u003e5.7L V8 engines\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"1178\" data-start=\"1108\"\u003e➡️ Fits many GM-based MerCruiser sterndrive and inboard applications\u003c\/p\u003e\n\u003chr data-end=\"1183\" data-start=\"1180\"\u003e\n\u003ch2 data-end=\"1222\" data-start=\"1185\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-end=\"1220\" data-start=\"1188\"\u003eSerial Number Fitment Notice\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp data-end=\"1242\" data-start=\"1223\"\u003eFitment depends on:\u003c\/p\u003e\n\u003cul data-end=\"1301\" data-start=\"1243\"\u003e\n\u003cli data-end=\"1268\" data-start=\"1243\"\u003eEngine model and year\u003c\/li\u003e\n\u003cli data-end=\"1301\" data-start=\"1269\"\u003eCooling system configuration\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"1387\" data-start=\"1303\"\u003e⚠️ Always confirm compatibility using your \u003cstrong data-end=\"1370\" data-start=\"1346\"\u003eengine serial number\u003c\/strong\u003e before ordering.\u003c\/p\u003e\n\u003chr data-end=\"1392\" data-start=\"1389\"\u003e\n\u003ch2 data-end=\"1415\" data-start=\"1394\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-end=\"1415\" data-start=\"1397\"\u003eSpecifications\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-end=\"1561\" data-start=\"1416\"\u003e\n\u003cli data-end=\"1444\" data-start=\"1416\"\u003ePart Number: \u003cstrong data-end=\"1442\" data-start=\"1431\"\u003e18-3552\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1472\" data-start=\"1445\"\u003eType: Engine thermostat\u003c\/li\u003e\n\u003cli data-end=\"1516\" data-start=\"1473\"\u003eFunction: Regulates coolant temperature\u003c\/li\u003e\n\u003cli data-end=\"1561\" data-start=\"1517\"\u003eConstruction: Marine-grade metal housing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-end=\"1566\" data-start=\"1563\"\u003e\n\u003ch2 data-end=\"1590\" data-start=\"1568\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-end=\"1590\" data-start=\"1571\"\u003eWhat’s Included\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-end=\"1645\" data-start=\"1591\"\u003e\n\u003cli data-end=\"1645\" data-start=\"1591\"\u003eThermostat (gasket sold separately unless specified)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-end=\"1650\" data-start=\"1647\"\u003e\n\u003ch2 data-end=\"1691\" data-start=\"1652\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-end=\"1691\" data-start=\"1655\"\u003eWhen This Part Needs Replacement\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp data-end=\"1729\" data-start=\"1692\"\u003eReplace the thermostat if you notice:\u003c\/p\u003e\n\u003cul data-end=\"1842\" data-start=\"1730\"\u003e\n\u003cli data-end=\"1752\" data-start=\"1730\"\u003eEngine overheating\u003c\/li\u003e\n\u003cli data-end=\"1780\" data-start=\"1753\"\u003eEngine running too cold\u003c\/li\u003e\n\u003cli data-end=\"1817\" data-start=\"1781\"\u003eFluctuating temperature readings\u003c\/li\u003e\n\u003cli data-end=\"1842\" data-start=\"1818\"\u003ePoor fuel efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-end=\"1847\" data-start=\"1844\"\u003e\n\u003ch2 data-end=\"1874\" data-start=\"1849\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-end=\"1874\" data-start=\"1852\"\u003eInstallation Notes\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-end=\"2039\" data-start=\"1875\"\u003e\n\u003cli data-end=\"1921\" data-start=\"1875\"\u003eReplace gasket or seal during installation\u003c\/li\u003e\n\u003cli data-end=\"1952\" data-start=\"1922\"\u003eEnsure correct orientation\u003c\/li\u003e\n\u003cli data-end=\"1996\" data-start=\"1953\"\u003eInspect housing for corrosion or debris\u003c\/li\u003e\n\u003cli data-end=\"2039\" data-start=\"1997\"\u003eTest cooling system after installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-end=\"2044\" data-start=\"2041\"\u003e\n\u003ch2 data-end=\"2088\" data-start=\"2046\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-end=\"2088\" data-start=\"2049\"\u003eAlternate \/ Superseded Part Numbers\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003ch3 data-end=\"2118\" data-start=\"2090\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-end=\"2118\" data-start=\"2094\"\u003eOEM Cross References\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul data-end=\"2175\" data-start=\"2119\"\u003e\n\u003cli data-end=\"2175\" data-start=\"2119\"\u003eMercury MerCruiser: \u003cstrong data-end=\"2173\" data-start=\"2141\"\u003e807252T1 \/ 807252Q5 \/ 853213\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-end=\"2180\" data-start=\"2177\"\u003e\n\u003ch3 data-end=\"2218\" data-start=\"2182\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-end=\"2218\" data-start=\"2186\"\u003eAftermarket Cross References\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul data-end=\"2242\" data-start=\"2219\"\u003e\n\u003cli data-end=\"2242\" data-start=\"2219\"\u003eSierra: \u003cstrong data-end=\"2240\" data-start=\"2229\"\u003e18-3552\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-end=\"2247\" data-start=\"2244\"\u003e\n\u003ch2 data-end=\"2266\" data-start=\"2249\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-end=\"2264\" data-start=\"2252\"\u003eShipping\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp data-end=\"2332\" data-start=\"2267\"\u003eShipping: Ships same or next day for fast Canada wide shipping. ⚓\u003c\/p\u003e\n\u003chr data-end=\"2337\" data-start=\"2334\"\u003e\n\u003ch3 data-end=\"2366\" data-start=\"2339\"\u003e💡 Parts Desk Insight\u003c\/h3\u003e\n\u003cp data-is-only-node=\"\" data-is-last-node=\"\" data-end=\"2504\" data-start=\"2367\"\u003eThis is a very common MerCruiser thermostat—if you’re servicing a \u003cstrong data-end=\"2453\" data-start=\"2433\"\u003e4.3, 5.0, or 5.7\u003c\/strong\u003e, it’s one of the first cooling parts to replace 👍\u003c\/p\u003e","brand":"WEST","offers":[{"title":"Default Title","offer_id":43564241518628,"sku":"SIE-18-3552","price":39.51,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/83d9e9d8-8b84-47c8-a5f0-4a6e99d66e7d.png?v=1774376462","url":"https:\/\/marisolmarine.com\/products\/sierra-18-3552-thermostat-mercury-mercruiser","provider":"Marisol Marine Company","version":"1.0","type":"link"}