{"product_id":"mercury-thermostat-assy-8m0090819","title":"Mercury – Thermostat Assembly | Cooling System | 120°F Rated | 8M0090819","description":"\u003cul data-start=\"796\" data-end=\"1268\"\u003e\u003c\/ul\u003e\n\u003ch2\u003e\u003cspan data-preserver-spaces=\"true\"\u003eMercury – Thermostat Assembly | Cooling System | 120°F Rated | 8M0090819\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eOverview\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eThere’s a certain comfort that comes from an engine running at just the right temperature. You can hear it in the steady rhythm at idle and feel it when you push the throttle and the boat lifts effortlessly onto plane. That sense of control and predictability doesn’t happen by accident—it’s the result of dependable parts doing their job quietly beneath the cowling. The Mercury 8M0090819 Thermostat Assembly brings that peace of mind to every outing, keeping your 75–115 horsepower FourStroke running exactly the way it should.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan data-preserver-spaces=\"true\"\u003eKey Features\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eMaintains a consistent 120-degree Fahrenheit operating temperature\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan data-preserver-spaces=\"true\"\u003eDesign\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eed for proper coolant flow in Mercury 2.1L EFI FourStroke outboards\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eDurable, thermally precise construction for reliable long-term performance\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eDirect-fit replacement engineered to Mercury Marine specifications\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eStraightforward installation using common tools\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan data-preserver-spaces=\"true\"\u003eEngine \u0026amp; Boat Compatibility\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eFits Mercury 75–115 horsepower 2.1L EFI FourStroke outboards\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan data-preserver-spaces=\"true\"\u003eCompat\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eible with a wide range of hull styles, including pontoons, center consoles, aluminum fishing boats, and runabouts\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eIdeal for freshwater and saltwater use\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan data-preserver-spaces=\"true\"\u003ePerformance \u0026amp; Practical Benefits\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eA thermostat may be a small piece of the cooling system, but it has a huge impact on how your engine behaves. With the 8M0090819 installed, your Mercury FourStroke warms quickly, holds a smooth idle, and avoids the sluggish feeling that comes from running too cool or too hot. The temperature regulation is steady, which helps improve combustion efficiency and protects internal components from unnecessary stress.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eOn the water, that translates into easy starts early in the morning, crisp throttle response when you’re navigating tight channels, and a dependable, steady feeling during long runs at mid-range speeds. The thermostat opens and closes with a tight, predictable motion, keeping the engine temperature dialed in no matter the load, the weather, or how long you’ve been running. And when you’re miles from the dock, that kind of reliability means everything.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan data-preserver-spaces=\"true\"\u003eWhy Buy OEM\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eCooling components must be precise—there’s simply no room for error. Mercury OEM thermostats are engineered to match the exact flow rate and temperature specifications your engine was designed for. Aftermarket versions often look similar, but the opening temperature can vary, which affects warm-up time, efficiency, and long-term reliability.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eWhen you choose the genuine Mercury Marine part number 8M0090819, you’re choosing a thermostat that seats cleanly, fits without forcing, and behaves exactly the way the factory intended. It’s the smarter investment in the long run, protecting the heart of your engine and keeping your time on the water trouble-free.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan data-preserver-spaces=\"true\"\u003eFAQ\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ1: Which Mercury engines does this thermostat fit?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e It’s designed specifically for Mercury 75–115 horsepower 2.1L EFI FourStroke outboards.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ2: What makes this thermostat different from aftermarket options?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e OEM thermostats open at the correct temperature and fit perfectly, ensuring proper coolant flow and consistent engine operation.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ3: How do I confirm this is the correct part for my engine?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Match your serial number and model details with your owner’s manual to verify compatibility.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ4: Can it be used in both saltwater and freshwater?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Yes—its materials and design tolerate both environments without issue.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ5: Is installation straightforward?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Most boat owners can replace it themselves with basic tools, following the steps in the service manual.\u003c\/span\u003e\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":45626535215395,"sku":"8M0090819","price":82.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/8m0090819_main.jpg?v=1760631366","url":"https:\/\/partsvu.com\/en-ca\/products\/mercury-thermostat-assy-8m0090819","provider":"PartsVu","version":"1.0","type":"link"}