{"product_id":"mercury-mercruiser-thermostat-kit-fits-1998-and-older-mcm-gm-inaeu-line-4-6-cylinder-engines-59078q3","title":"Mercury – Quicksilver Thermostat Kit | Cooling System Component | 140°F Thermostat \u0026amp; Cork Gasket | 59078Q3","description":"\u003cp data-start=\"0\" data-end=\"112\"\u003e\u003cstrong data-start=\"0\" data-end=\"110\"\u003eMercury – Quicksilver Thermostat Kit | Cooling System Component | 140°F Thermostat \u0026amp; Cork Gasket | 59078Q3\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr data-start=\"114\" data-end=\"117\"\u003e\n\u003ch3 data-start=\"119\" data-end=\"137\"\u003e\u003cstrong data-start=\"123\" data-end=\"135\"\u003eOverview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"138\" data-end=\"654\"\u003eThe right temperature makes all the difference in performance. The \u003cstrong data-start=\"205\" data-end=\"258\"\u003eMercury Marine 59078Q3 Quicksilver Thermostat Kit\u003c\/strong\u003e helps older MerCruiser inline 4- and 6-cylinder engines maintain steady, efficient operating temperatures. Designed for \u003cstrong data-start=\"379\" data-end=\"410\"\u003eGM-built MerCruiser engines\u003c\/strong\u003e, this kit includes a \u003cstrong data-start=\"432\" data-end=\"452\"\u003e140°F thermostat\u003c\/strong\u003e and a \u003cstrong data-start=\"459\" data-end=\"474\"\u003ecork gasket\u003c\/strong\u003e for a complete, ready-to-install replacement. It’s a straightforward, durable solution that keeps your engine running cool, fuel-efficient, and protected from heat-related wear.\u003c\/p\u003e\n\u003chr data-start=\"656\" data-end=\"659\"\u003e\n\u003ch3 data-start=\"661\" data-end=\"683\"\u003e\u003cstrong data-start=\"665\" data-end=\"681\"\u003eKey Features\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli data-start=\"686\" data-end=\"772\"\u003e\n\u003cstrong data-start=\"686\" data-end=\"698\"\u003ePurpose:\u003c\/strong\u003e Regulates coolant flow to maintain optimal 140°F operating temperature.\u003c\/li\u003e\n\u003cli data-start=\"775\" data-end=\"865\"\u003e\n\u003cstrong data-start=\"775\" data-end=\"788\"\u003eContents:\u003c\/strong\u003e Includes \u003cstrong data-start=\"798\" data-end=\"834\"\u003e140°F thermostat and cork gasket\u003c\/strong\u003e for a complete installation.\u003c\/li\u003e\n\u003cli data-start=\"868\" data-end=\"968\"\u003e\n\u003cstrong data-start=\"868\" data-end=\"881\"\u003eMaterial:\u003c\/strong\u003e Built from \u003cstrong data-start=\"893\" data-end=\"926\"\u003emarine-grade metal components\u003c\/strong\u003e for corrosion resistance and long life.\u003c\/li\u003e\n\u003cli data-start=\"971\" data-end=\"1071\"\u003e\n\u003cstrong data-start=\"971\" data-end=\"987\"\u003ePerformance:\u003c\/strong\u003e Helps your engine warm up quickly and stay at the correct temperature under load.\u003c\/li\u003e\n\u003cli data-start=\"1074\" data-end=\"1156\"\u003e\n\u003cstrong data-start=\"1074\" data-end=\"1090\"\u003eEase of Use:\u003c\/strong\u003e Direct-fit design makes replacement simple with standard tools.\u003c\/li\u003e\n\u003cli data-start=\"1159\" data-end=\"1241\"\u003e\n\u003cstrong data-start=\"1159\" data-end=\"1174\"\u003eDurability:\u003c\/strong\u003e Withstands the constant heat cycles and vibration of marine use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1243\" data-end=\"1246\"\u003e\n\u003ch3 data-start=\"1248\" data-end=\"1285\"\u003e\u003cstrong data-start=\"1252\" data-end=\"1283\"\u003eEngine \u0026amp; Boat Compatibility\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli data-start=\"1288\" data-end=\"1355\"\u003eOlder MerCruiser inline 4-cylinder engines (General Motors-based)\u003c\/li\u003e\n\u003cli data-start=\"1358\" data-end=\"1425\"\u003eOlder MerCruiser inline 6-cylinder engines (General Motors-based)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1427\" data-end=\"1430\"\u003e\n\u003ch3 data-start=\"1432\" data-end=\"1475\"\u003e\u003cstrong data-start=\"1436\" data-end=\"1473\"\u003ePerformance \u0026amp; Real-World Benefits\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"1476\" data-end=\"1819\"\u003eThe \u003cstrong data-start=\"1480\" data-end=\"1506\"\u003e59078Q3 thermostat kit\u003c\/strong\u003e keeps your cooling system running right by maintaining a consistent temperature balance. The 140°F thermostat ensures your engine warms up fast, runs cleanly, and avoids overheating. The included cork gasket forms a tight, leak-free seal, preventing coolant loss and maintaining pressure throughout the system.\u003c\/p\u003e\n\u003cp data-start=\"1821\" data-end=\"2046\"\u003eA properly functioning thermostat helps improve efficiency, reduce wear, and protect your motor from heat damage. Replacing it during routine maintenance is an easy step that helps extend the life of your MerCruiser engine.\u003c\/p\u003e\n\u003chr data-start=\"2048\" data-end=\"2051\"\u003e\n\u003ch3 data-start=\"2053\" data-end=\"2085\"\u003e\u003cstrong data-start=\"2057\" data-end=\"2083\"\u003eWhy Choose Mercury OEM\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"2086\" data-end=\"2331\"\u003eThe \u003cstrong data-start=\"2090\" data-end=\"2113\"\u003eQuicksilver 59078Q3\u003c\/strong\u003e is a \u003cstrong data-start=\"2119\" data-end=\"2149\"\u003egenuine Mercury Marine kit\u003c\/strong\u003e, designed specifically for older MerCruiser engines built by GM. Aftermarket thermostats might look the same but often open at the wrong temperature or use poor sealing materials.\u003c\/p\u003e\n\u003cp data-start=\"2333\" data-end=\"2559\"\u003eMercury OEM parts are precision-calibrated and tested for marine performance, ensuring accurate operation and a proper fit. You can count on Mercury’s engineering to deliver reliable temperature control, season after season.\u003c\/p\u003e\n\u003chr data-start=\"2561\" data-end=\"2564\"\u003e\n\u003ch3 data-start=\"2566\" data-end=\"2579\"\u003e\u003cstrong data-start=\"2570\" data-end=\"2577\"\u003eFAQ\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"2581\" data-end=\"2722\"\u003e\u003cstrong data-start=\"2581\" data-end=\"2631\"\u003eQ1: What engines does this thermostat kit fit?\u003c\/strong\u003e\u003cbr data-start=\"2631\" data-end=\"2634\"\u003eIt fits \u003cstrong data-start=\"2642\" data-end=\"2695\"\u003eolder MerCruiser inline 4- and 6-cylinder engines\u003c\/strong\u003e built by General Motors.\u003c\/p\u003e\n\u003cp data-start=\"2724\" data-end=\"2861\"\u003e\u003cstrong data-start=\"2724\" data-end=\"2777\"\u003eQ2: What temperature does the thermostat open at?\u003c\/strong\u003e\u003cbr data-start=\"2777\" data-end=\"2780\"\u003eIt’s rated for \u003cstrong data-start=\"2795\" data-end=\"2804\"\u003e140°F\u003c\/strong\u003e, the ideal temperature for efficient engine operation.\u003c\/p\u003e\n\u003cp data-start=\"2863\" data-end=\"2977\"\u003e\u003cstrong data-start=\"2863\" data-end=\"2898\"\u003eQ3: What’s included in the kit?\u003c\/strong\u003e\u003cbr data-start=\"2898\" data-end=\"2901\"\u003eYou get the \u003cstrong data-start=\"2913\" data-end=\"2927\"\u003ethermostat\u003c\/strong\u003e and a \u003cstrong data-start=\"2934\" data-end=\"2949\"\u003ecork gasket\u003c\/strong\u003e for complete replacement.\u003c\/p\u003e\n\u003cp data-start=\"2979\" data-end=\"3096\"\u003e\u003cstrong data-start=\"2979\" data-end=\"3009\"\u003eQ4: Is it hard to install?\u003c\/strong\u003e\u003cbr data-start=\"3009\" data-end=\"3012\"\u003eNot at all — it’s a direct-fit replacement that can be installed with basic tools.\u003c\/p\u003e\n\u003cp data-start=\"3098\" data-end=\"3257\"\u003e\u003cstrong data-start=\"3098\" data-end=\"3138\"\u003eQ5: Why choose OEM over aftermarket?\u003c\/strong\u003e\u003cbr data-start=\"3138\" data-end=\"3141\"\u003eMercury’s OEM parts are factory-calibrated for marine performance and tested to ensure durability and precise fit.\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":46939283128611,"sku":"59078Q3","price":32.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/59078t3_1.jpg?v=1761568599","url":"https:\/\/partsvu.com\/en-mx\/products\/mercury-mercruiser-thermostat-kit-fits-1998-and-older-mcm-gm-inaeu-line-4-6-cylinder-engines-59078q3","provider":"PartsVu","version":"1.0","type":"link"}