{"product_id":"hella-354777921-engine-coolant-thermostat","title":"Hella 354777921 Engine Coolant Thermostat","description":"\u003ch2\u003eEngine Cooling Control for Mercedes-Benz\u003c\/h2\u003e\u003cp\u003eThis Hella engine coolant thermostat helps regulate coolant flow so the engine can reach and maintain the proper operating temperature. It is a direct-fit service part for select Mercedes-Benz diesel and gasoline models, including GLS350d, GLE350d, ML350, E350, R350, S350, GL350, GL320, ML320, and R320 applications.\u003c\/p\u003e\u003cp\u003ePart number 354777921 is built around a 92°C opening temperature and includes a seal for service replacement. If you are replacing a thermostat on a Mercedes-Benz ML350, E350, or GL350, this Hella thermostat supports stable temperature control and consistent cabin heat performance.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eOpening temperature: 92°C \/ 197.6°F\u003c\/li\u003e\n\u003cli\u003eIncludes seal for installation\u003c\/li\u003e\n\u003cli\u003eHelps the engine reach operating temperature quickly\u003c\/li\u003e\n\u003cli\u003eSupports fuel-efficient higher operating temperature control\u003c\/li\u003e\n\u003cli\u003eFits select Mercedes-Benz GLS350d, GLE350d, ML350, E350, R350, S350, GL350, GL320, ML320, and R320 models\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eThermostat Function and Fitment\u003c\/h2\u003e\u003cp\u003eThe coolant thermostat is a key part of the engine cooling system. On select Mercedes-Benz ML350, E350, and GL350 vehicles, it manages coolant circulation so the engine warms up promptly and stays within the intended temperature range. Hella uses a wax thermostat design with an electric heating element to support precise temperature regulation under changing driving conditions. Part number 354777921 cross-references Nissens 92837 for the same application.\u003c\/p\u003e\u003ch2\u003eCommon Problems This Part Can Address\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eSlow engine warm-up after cold starts\u003c\/li\u003e\n\u003cli\u003eTemperature fluctuations during normal driving\u003c\/li\u003e\n\u003cli\u003eCabin heat that takes too long to become available\u003c\/li\u003e\n\u003cli\u003eCooling system operation that does not maintain the expected temperature range\u003c\/li\u003e\n\u003cli\u003eThermostat replacement during cooling system service\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\u003cp\u003eAssy\/disassy by qualified personnel required. Inspect the cooling system housing, mating surfaces, and coolant condition before installation. Replace the seal as part of the service, and follow the vehicle manufacturer’s bleed and refill procedure after installation. Verify the opening temperature specification matches the vehicle application before fitting.\u003c\/p\u003e\u003ch2\u003eQuality Assurance\u003c\/h2\u003e\u003cp\u003eHella thermostats are engineered for a wide range of passenger and commercial vehicle cooling systems, with application coverage that includes modern thermostat designs and OE-style service replacements. Part number 354777921 is specified with a 92°C opening temperature and seal for the listed Mercedes-Benz applications.\u003c\/p\u003e","brand":"Hella","offers":[{"title":"Default Title","offer_id":52966219088053,"sku":"BFDP-354777921","price":42.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/HL_354777921_Fro.jpg?v=1786602047","url":"https:\/\/www.partcatalog.com\/products\/hella-354777921-engine-coolant-thermostat","provider":"PartCatalog","version":"1.0","type":"link"}