{"product_id":"mercury-mercruiser-thermostat-kit-fits-1998-and-older-mcm-gm-inaeu-line-4-6-cylinder-engines-59078t3","title":"Mercury – Thermostat Kit | Cooling System Part | Inline 4 \u0026amp; 6 GM Engines | 59078T3","description":"\u003cp data-start=\"0\" data-end=\"88\"\u003e\u003cstrong data-start=\"0\" data-end=\"86\"\u003eMercury – Thermostat Kit | Cooling System Part | Inline 4 \u0026amp; 6 GM Engines | 59078T3\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr data-start=\"90\" data-end=\"93\"\u003e\n\u003ch3 data-start=\"95\" data-end=\"113\"\u003e\u003cstrong data-start=\"99\" data-end=\"111\"\u003eOverview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"114\" data-end=\"669\"\u003eEvery engine runs better when it’s running at the right temperature. The \u003cstrong data-start=\"187\" data-end=\"228\"\u003eMercury Marine 59078T3 Thermostat Kit\u003c\/strong\u003e helps older \u003cstrong data-start=\"241\" data-end=\"297\"\u003eGM-built MerCruiser inline 4- and 6-cylinder engines\u003c\/strong\u003e warm up quickly and stay at a steady 140°F — the sweet spot for smooth performance and long life. This kit includes both the \u003cstrong data-start=\"423\" data-end=\"453\"\u003ethermostat and cork gasket\u003c\/strong\u003e, so you can replace everything at once and get back on the water fast. Built tough from corrosion-resistant metal, it’s designed to handle years of heat, vibration, and marine exposure without sticking or leaking.\u003c\/p\u003e\n\u003chr data-start=\"671\" data-end=\"674\"\u003e\n\u003ch3 data-start=\"676\" data-end=\"698\"\u003e\u003cstrong data-start=\"680\" data-end=\"696\"\u003eKey Features\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli data-start=\"701\" data-end=\"790\"\u003e\n\u003cstrong data-start=\"701\" data-end=\"713\"\u003ePurpose:\u003c\/strong\u003e Keeps your MerCruiser running at a steady temperature for top performance.\u003c\/li\u003e\n\u003cli data-start=\"793\" data-end=\"892\"\u003e\n\u003cstrong data-start=\"793\" data-end=\"806\"\u003eContents:\u003c\/strong\u003e Comes with a \u003cstrong data-start=\"820\" data-end=\"840\"\u003e140°F thermostat\u003c\/strong\u003e and a \u003cstrong data-start=\"847\" data-end=\"862\"\u003ecork gasket\u003c\/strong\u003e for a complete replacement.\u003c\/li\u003e\n\u003cli data-start=\"895\" data-end=\"979\"\u003e\n\u003cstrong data-start=\"895\" data-end=\"908\"\u003eMaterial:\u003c\/strong\u003e Made from \u003cstrong data-start=\"919\" data-end=\"942\"\u003emarine-grade metals\u003c\/strong\u003e that resist corrosion and pitting.\u003c\/li\u003e\n\u003cli data-start=\"982\" data-end=\"1083\"\u003e\n\u003cstrong data-start=\"982\" data-end=\"998\"\u003ePerformance:\u003c\/strong\u003e Helps the engine warm up fast, hold temperature under load, and avoid overheating.\u003c\/li\u003e\n\u003cli data-start=\"1086\" data-end=\"1163\"\u003e\n\u003cstrong data-start=\"1086\" data-end=\"1101\"\u003eDurability:\u003c\/strong\u003e Handles tough marine conditions without warping or binding.\u003c\/li\u003e\n\u003cli data-start=\"1166\" data-end=\"1246\"\u003e\n\u003cstrong data-start=\"1166\" data-end=\"1182\"\u003eEase of Use:\u003c\/strong\u003e Installs easily with hand tools — simple, fast, and reliable.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1248\" data-end=\"1251\"\u003e\n\u003ch3 data-start=\"1253\" data-end=\"1290\"\u003e\u003cstrong data-start=\"1257\" data-end=\"1288\"\u003eEngine \u0026amp; Boat Compatibility\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli data-start=\"1293\" data-end=\"1346\"\u003eOlder GM-built MerCruiser inline 4-cylinder engines\u003c\/li\u003e\n\u003cli data-start=\"1349\" data-end=\"1402\"\u003eOlder GM-built MerCruiser inline 6-cylinder engines\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1404\" data-end=\"1407\"\u003e\n\u003ch3 data-start=\"1409\" data-end=\"1452\"\u003e\u003cstrong data-start=\"1413\" data-end=\"1450\"\u003ePerformance \u0026amp; Real-World Benefits\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"1453\" data-end=\"1795\"\u003eA thermostat may not be the most exciting part on your engine, but it’s one of the most important. The \u003cstrong data-start=\"1556\" data-end=\"1571\"\u003e59078T3 kit\u003c\/strong\u003e helps your cooling system stay balanced — not running too cold and not too hot. The 140°F thermostat makes sure your engine reaches the right temperature quickly, improving efficiency and protecting against internal wear.\u003c\/p\u003e\n\u003cp data-start=\"1797\" data-end=\"2034\"\u003eThe included cork gasket seals tight, preventing leaks and pressure loss that can lead to overheating. Swapping your thermostat regularly keeps your cooling system in top shape, giving you peace of mind every time you start the engine.\u003c\/p\u003e\n\u003chr data-start=\"2036\" data-end=\"2039\"\u003e\n\u003ch3 data-start=\"2041\" data-end=\"2073\"\u003e\u003cstrong data-start=\"2045\" data-end=\"2071\"\u003eWhy Choose Mercury OEM\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"2074\" data-end=\"2313\"\u003eThe \u003cstrong data-start=\"2078\" data-end=\"2097\"\u003eMercury 59078T3\u003c\/strong\u003e is the same quality part Mercury installs at the factory — built, tested, and proven for marine use. Aftermarket thermostats might open too early, run at the wrong temperature, or corrode before the season’s over.\u003c\/p\u003e\n\u003cp data-start=\"2315\" data-end=\"2513\"\u003eMercury’s OEM design ensures accurate temperature control, a perfect fit, and long-lasting reliability. It’s a small, affordable part that helps your older MerCruiser run smoother and last longer.\u003c\/p\u003e\n\u003chr data-start=\"2515\" data-end=\"2518\"\u003e\n\u003ch3 data-start=\"2520\" data-end=\"2533\"\u003e\u003cstrong data-start=\"2524\" data-end=\"2531\"\u003eFAQ\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"2535\" data-end=\"2662\"\u003e\u003cstrong data-start=\"2535\" data-end=\"2586\"\u003eQ1: Which engines does this thermostat kit fit?\u003c\/strong\u003e\u003cbr data-start=\"2586\" data-end=\"2589\"\u003eIt fits \u003cstrong data-start=\"2597\" data-end=\"2659\"\u003eolder GM-built MerCruiser inline 4- and 6-cylinder engines\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp data-start=\"2664\" data-end=\"2777\"\u003e\u003cstrong data-start=\"2664\" data-end=\"2688\"\u003eQ2: What’s included?\u003c\/strong\u003e\u003cbr data-start=\"2688\" data-end=\"2691\"\u003eThe kit includes a \u003cstrong data-start=\"2710\" data-end=\"2730\"\u003e140°F thermostat\u003c\/strong\u003e and \u003cstrong data-start=\"2735\" data-end=\"2750\"\u003ecork gasket\u003c\/strong\u003e for a leak-free install.\u003c\/p\u003e\n\u003cp data-start=\"2779\" data-end=\"2920\"\u003e\u003cstrong data-start=\"2779\" data-end=\"2825\"\u003eQ3: What are the signs it needs replacing?\u003c\/strong\u003e\u003cbr data-start=\"2825\" data-end=\"2828\"\u003eIf your engine overheats, runs cold, or fluctuates in temperature, it’s time to change it.\u003c\/p\u003e\n\u003cp data-start=\"2922\" data-end=\"3023\"\u003e\u003cstrong data-start=\"2922\" data-end=\"2954\"\u003eQ4: Can I replace it myself?\u003c\/strong\u003e\u003cbr data-start=\"2954\" data-end=\"2957\"\u003eYes — it’s an easy job with basic tools and your service manual.\u003c\/p\u003e\n\u003cp data-start=\"3025\" data-end=\"3177\"\u003e\u003cstrong data-start=\"3025\" data-end=\"3064\"\u003eQ5: Why OEM instead of aftermarket?\u003c\/strong\u003e\u003cbr data-start=\"3064\" data-end=\"3067\"\u003eOEM thermostats fit right, last longer, and maintain the temperature range Mercury designed for your engine.\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":46939282506019,"sku":"59078T3","price":35.53,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/59078T3_Main.jpg?v=1760631166","url":"https:\/\/partsvu.com\/en-ca\/products\/mercury-mercruiser-thermostat-kit-fits-1998-and-older-mcm-gm-inaeu-line-4-6-cylinder-engines-59078t3","provider":"PartsVu","version":"1.0","type":"link"}