{"product_id":"mercury-thermostat-140-mz-59078","title":"Mercury – Quicksilver Thermostat | Cooling System Component | 140°F Temperature Rating | 59078","description":"\u003cp data-start=\"0\" data-end=\"100\"\u003e\u003cstrong data-start=\"0\" data-end=\"98\"\u003eMercury – Quicksilver Thermostat | Cooling System Component | 140°F Temperature Rating | 59078\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr data-start=\"102\" data-end=\"105\"\u003e\n\u003ch3 data-start=\"107\" data-end=\"125\"\u003e\u003cstrong data-start=\"111\" data-end=\"123\"\u003eOverview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"126\" data-end=\"742\"\u003eKeeping your engine running at the right temperature is key to performance and longevity. The \u003cstrong data-start=\"220\" data-end=\"267\"\u003eMercury Marine 59078 Quicksilver Thermostat\u003c\/strong\u003e is a direct replacement for select \u003cstrong data-start=\"303\" data-end=\"329\"\u003eMerCruiser sterndrives\u003c\/strong\u003e, maintaining an optimal \u003cstrong data-start=\"354\" data-end=\"385\"\u003e140°F operating temperature\u003c\/strong\u003e for efficient cooling and smooth performance. It’s built for \u003cstrong data-start=\"447\" data-end=\"472\"\u003eMerCruiser 120HP 2.5L\u003c\/strong\u003e, \u003cstrong data-start=\"474\" data-end=\"488\"\u003e140HP 3.0L\u003c\/strong\u003e, and \u003cstrong data-start=\"494\" data-end=\"511\"\u003e160HP engines\u003c\/strong\u003e, using corrosion-resistant materials that hold up to marine heat, pressure, and salt exposure. Easy to install and precision-calibrated, this thermostat helps your engine stay cool, responsive, and protected season after season.\u003c\/p\u003e\n\u003chr data-start=\"744\" data-end=\"747\"\u003e\n\u003ch3 data-start=\"749\" data-end=\"771\"\u003e\u003cstrong data-start=\"753\" data-end=\"769\"\u003eKey Features\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli data-start=\"774\" data-end=\"869\"\u003e\n\u003cstrong data-start=\"774\" data-end=\"786\"\u003ePurpose:\u003c\/strong\u003e Regulates engine temperature to improve fuel efficiency and prevent overheating.\u003c\/li\u003e\n\u003cli data-start=\"872\" data-end=\"977\"\u003e\n\u003cstrong data-start=\"872\" data-end=\"895\"\u003eTemperature Rating:\u003c\/strong\u003e Opens at \u003cstrong data-start=\"905\" data-end=\"914\"\u003e140°F\u003c\/strong\u003e, maintaining the ideal range for MerCruiser cooling systems.\u003c\/li\u003e\n\u003cli data-start=\"980\" data-end=\"1071\"\u003e\n\u003cstrong data-start=\"980\" data-end=\"993\"\u003eMaterial:\u003c\/strong\u003e Made from \u003cstrong data-start=\"1004\" data-end=\"1027\"\u003emarine-grade metals\u003c\/strong\u003e designed to resist corrosion and scaling.\u003c\/li\u003e\n\u003cli data-start=\"1074\" data-end=\"1149\"\u003e\n\u003cstrong data-start=\"1074\" data-end=\"1090\"\u003ePerformance:\u003c\/strong\u003e Ensures quick warm-up and consistent cooling under load.\u003c\/li\u003e\n\u003cli data-start=\"1152\" data-end=\"1236\"\u003e\n\u003cstrong data-start=\"1152\" data-end=\"1168\"\u003eEase of Use:\u003c\/strong\u003e Direct-fit replacement that installs easily using standard tools.\u003c\/li\u003e\n\u003cli data-start=\"1239\" data-end=\"1347\"\u003e\n\u003cstrong data-start=\"1239\" data-end=\"1254\"\u003eDurability:\u003c\/strong\u003e Built to withstand marine vibration, heat, and water exposure without sticking or warping.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1349\" data-end=\"1352\"\u003e\n\u003ch3 data-start=\"1354\" data-end=\"1391\"\u003e\u003cstrong data-start=\"1358\" data-end=\"1389\"\u003eEngine \u0026amp; Boat Compatibility\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli data-start=\"1394\" data-end=\"1448\"\u003eMerCruiser 120HP 2.5L (serial No. 2324347 and above)\u003c\/li\u003e\n\u003cli data-start=\"1451\" data-end=\"1506\"\u003eMerCruiser 140HP 3.0L (serial No. 0L340999 and below)\u003c\/li\u003e\n\u003cli data-start=\"1509\" data-end=\"1527\"\u003eMerCruiser 160HP\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1529\" data-end=\"1532\"\u003e\n\u003ch3 data-start=\"1534\" data-end=\"1577\"\u003e\u003cstrong data-start=\"1538\" data-end=\"1575\"\u003ePerformance \u0026amp; Real-World Benefits\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"1578\" data-end=\"1887\"\u003eThe \u003cstrong data-start=\"1582\" data-end=\"1602\"\u003e59078 thermostat\u003c\/strong\u003e keeps your engine operating at the perfect balance of temperature and efficiency. Too cold and you’ll waste fuel — too hot and you risk engine damage. This thermostat opens precisely at 140°F, providing a steady flow of coolant to maintain proper heat balance throughout the system.\u003c\/p\u003e\n\u003cp data-start=\"1889\" data-end=\"2125\"\u003eIts corrosion-resistant design makes it reliable even after years in salt or brackish water. A fresh thermostat helps your engine start easier, run smoother, and maintain consistent power — simple maintenance that pays off every trip.\u003c\/p\u003e\n\u003chr data-start=\"2127\" data-end=\"2130\"\u003e\n\u003ch3 data-start=\"2132\" data-end=\"2164\"\u003e\u003cstrong data-start=\"2136\" data-end=\"2162\"\u003eWhy Choose Mercury OEM\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"2165\" data-end=\"2451\"\u003eThe \u003cstrong data-start=\"2169\" data-end=\"2190\"\u003eQuicksilver 59078\u003c\/strong\u003e is a \u003cstrong data-start=\"2196\" data-end=\"2227\"\u003egenuine Mercury Marine part\u003c\/strong\u003e, engineered specifically for your MerCruiser engine’s cooling system. Aftermarket thermostats can vary slightly in calibration or material quality, which can affect how your engine warms up or handles temperature changes.\u003c\/p\u003e\n\u003cp data-start=\"2453\" data-end=\"2699\"\u003eMercury’s OEM parts are built to precise temperature tolerances and tested for long-term durability in marine conditions. Installing an OEM thermostat ensures your cooling system performs exactly as designed — steady, efficient, and dependable.\u003c\/p\u003e\n\u003chr data-start=\"2701\" data-end=\"2704\"\u003e\n\u003ch3 data-start=\"2706\" data-end=\"2719\"\u003e\u003cstrong data-start=\"2710\" data-end=\"2717\"\u003eFAQ\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"2721\" data-end=\"2869\"\u003e\u003cstrong data-start=\"2721\" data-end=\"2767\"\u003eQ1: What engines does this thermostat fit?\u003c\/strong\u003e\u003cbr data-start=\"2767\" data-end=\"2770\"\u003eIt fits \u003cstrong data-start=\"2778\" data-end=\"2858\"\u003eMerCruiser 120HP 2.5L (2324347+), 140HP 3.0L (0L340999 and below), and 160HP\u003c\/strong\u003e engines.\u003c\/p\u003e\n\u003cp data-start=\"2871\" data-end=\"2987\"\u003e\u003cstrong data-start=\"2871\" data-end=\"2916\"\u003eQ2: What temperature does it regulate at?\u003c\/strong\u003e\u003cbr data-start=\"2916\" data-end=\"2919\"\u003eIt opens at \u003cstrong data-start=\"2931\" data-end=\"2940\"\u003e140°F\u003c\/strong\u003e, maintaining consistent cooling performance.\u003c\/p\u003e\n\u003cp data-start=\"2989\" data-end=\"3130\"\u003e\u003cstrong data-start=\"2989\" data-end=\"3023\"\u003eQ3: How hard is it to install?\u003c\/strong\u003e\u003cbr data-start=\"3023\" data-end=\"3026\"\u003eInstallation is simple — remove the old thermostat, clean the housing, and replace with this OEM part.\u003c\/p\u003e\n\u003cp data-start=\"3132\" data-end=\"3250\"\u003e\u003cstrong data-start=\"3132\" data-end=\"3169\"\u003eQ4: Is it made for saltwater use?\u003c\/strong\u003e\u003cbr data-start=\"3169\" data-end=\"3172\"\u003eYes — it’s constructed from \u003cstrong data-start=\"3200\" data-end=\"3247\"\u003ecorrosion-resistant, marine-grade materials\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp data-start=\"3252\" data-end=\"3410\"\u003e\u003cstrong data-start=\"3252\" data-end=\"3291\"\u003eQ5: Why OEM instead of aftermarket?\u003c\/strong\u003e\u003cbr data-start=\"3291\" data-end=\"3294\"\u003eMercury OEM thermostats are factory-calibrated and built to last, guaranteeing proper temperature control and fit.\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":46939284832547,"sku":"59078","price":33.48,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/59078_main.jpg?v=1760631153","url":"https:\/\/partsvu.com\/en-mx\/products\/mercury-thermostat-140-mz-59078","provider":"PartsVu","version":"1.0","type":"link"}