{"product_id":"volvo-penta-thermostat-21437904","title":"Volvo Penta Thermostat – 21437904","description":"\u003cp data-start=\"123\" data-end=\"281\"\u003eThe \u003cstrong data-start=\"127\" data-end=\"162\"\u003eVolvo Penta 21437904 Thermostat\u003c\/strong\u003e is a genuine OEM cooling system component engineered for precise temperature regulation in Volvo Penta marine engines.\u003c\/p\u003e\n\u003cp data-start=\"283\" data-end=\"651\"\u003eThis thermostat uses an advanced wax-element mechanism to control coolant flow based on engine temperature. As the engine warms, the internal element expands, opening the valve to allow coolant circulation and maintain optimal operating conditions. This ensures proper combustion efficiency, stable oil viscosity, and protection of critical internal engine components.\u003c\/p\u003e\n\u003cp data-start=\"653\" data-end=\"1049\"\u003eDesigned with modern Volvo Penta cooling system architecture, this thermostat incorporates \u003cstrong data-start=\"744\" data-end=\"789\"\u003ebleed notches and internal check features\u003c\/strong\u003e to help purge air from the system, improving cooling efficiency and preventing hot spots. Stainless steel internal components and a robust housing provide long service life in both freshwater and saltwater environments. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1051\" data-end=\"1206\"\u003eBuilt to Volvo Penta’s exact specifications, this unit delivers consistent opening characteristics, reliable performance under load, and exact OEM fitment.\u003c\/p\u003e\n\u003chr data-start=\"1208\" data-end=\"1211\"\u003e\n\u003ch2 data-start=\"1213\" data-end=\"1232\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"1216\" data-end=\"1232\"\u003eKey Features\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-start=\"1233\" data-end=\"1628\"\u003e\n\u003cli data-start=\"1233\" data-end=\"1271\"\u003eGenuine Volvo Penta OEM thermostat\u003c\/li\u003e\n\u003cli data-start=\"1272\" data-end=\"1317\"\u003ePrecision wax-element temperature control\u003c\/li\u003e\n\u003cli data-start=\"1318\" data-end=\"1367\"\u003eIntegrated bleed design to reduce air pockets\u003c\/li\u003e\n\u003cli data-start=\"1368\" data-end=\"1418\"\u003eMaintains optimal engine operating temperature\u003c\/li\u003e\n\u003cli data-start=\"1419\" data-end=\"1471\"\u003ePrevents overheating and cold-running conditions\u003c\/li\u003e\n\u003cli data-start=\"1472\" data-end=\"1522\"\u003eDurable stainless steel and brass construction\u003c\/li\u003e\n\u003cli data-start=\"1523\" data-end=\"1574\"\u003eDesigned for modern Volvo Penta cooling systems\u003c\/li\u003e\n\u003cli data-start=\"1575\" data-end=\"1628\"\u003eDirect OEM replacement – no modification required\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1630\" data-end=\"1633\"\u003e\n\u003ch2 data-start=\"1635\" data-end=\"1662\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"1638\" data-end=\"1662\"\u003eEngine Compatibility\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003ch3 data-start=\"1664\" data-end=\"1698\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"1668\" data-end=\"1698\"\u003eVolvo Penta Marine Engines\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp data-start=\"1699\" data-end=\"1762\"\u003eUsed across a range of modern Volvo Penta platforms, including:\u003c\/p\u003e\n\u003ch3 data-start=\"1764\" data-end=\"1786\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"1768\" data-end=\"1786\"\u003eDiesel Engines\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul data-start=\"1787\" data-end=\"1864\"\u003e\n\u003cli data-start=\"1787\" data-end=\"1812\"\u003eVolvo Penta D3 series\u003c\/li\u003e\n\u003cli data-start=\"1813\" data-end=\"1838\"\u003eVolvo Penta D4 series\u003c\/li\u003e\n\u003cli data-start=\"1839\" data-end=\"1864\"\u003eVolvo Penta D6 series\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-start=\"1866\" data-end=\"1920\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"1870\" data-end=\"1920\"\u003eGasoline Engines (select late-model platforms)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul data-start=\"1921\" data-end=\"1978\"\u003e\n\u003cli data-start=\"1921\" data-end=\"1978\"\u003eVolvo Penta V6 and V8 engines (application dependent)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1980\" data-end=\"2062\"\u003e➡️ Commonly found in \u003cstrong data-start=\"2001\" data-end=\"2062\"\u003emodern sterndrive and inboard Volvo Penta cooling systems\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr data-start=\"2064\" data-end=\"2067\"\u003e\n\u003ch2 data-start=\"2069\" data-end=\"2106\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"2072\" data-end=\"2104\"\u003eSerial Number Fitment Notice\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp data-start=\"2107\" data-end=\"2126\"\u003eFitment depends on:\u003c\/p\u003e\n\u003cul data-start=\"2127\" data-end=\"2201\"\u003e\n\u003cli data-start=\"2127\" data-end=\"2155\"\u003eEngine model and variant\u003c\/li\u003e\n\u003cli data-start=\"2156\" data-end=\"2175\"\u003eProduction year\u003c\/li\u003e\n\u003cli data-start=\"2176\" data-end=\"2201\"\u003eCooling system design\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2203\" data-end=\"2287\"\u003e⚠️ Always confirm compatibility using your \u003cstrong data-start=\"2246\" data-end=\"2270\"\u003eengine serial number\u003c\/strong\u003e before ordering.\u003c\/p\u003e\n\u003chr data-start=\"2289\" data-end=\"2292\"\u003e\n\u003ch2 data-start=\"2294\" data-end=\"2315\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"2297\" data-end=\"2315\"\u003eSpecifications\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-start=\"2316\" data-end=\"2677\"\u003e\n\u003cli data-start=\"2316\" data-end=\"2345\"\u003ePart Number: \u003cstrong data-start=\"2331\" data-end=\"2343\"\u003e21437904\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2346\" data-end=\"2373\"\u003eType: Engine thermostat\u003c\/li\u003e\n\u003cli data-start=\"2374\" data-end=\"2433\"\u003eFunction: Regulates coolant flow and engine temperature\u003c\/li\u003e\n\u003cli data-start=\"2434\" data-end=\"2481\"\u003eOperation: Wax-element, spring-loaded valve\u003c\/li\u003e\n\u003cli data-start=\"2482\" data-end=\"2569\"\u003eConstruction:\n\u003cul data-start=\"2502\" data-end=\"2569\"\u003e\n\u003cli data-start=\"2502\" data-end=\"2541\"\u003eStainless steel internal components\u003c\/li\u003e\n\u003cli data-start=\"2544\" data-end=\"2569\"\u003eBrass thermal element\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2570\" data-end=\"2677\"\u003eDesign Features:\n\u003cul data-start=\"2593\" data-end=\"2677\"\u003e\n\u003cli data-start=\"2593\" data-end=\"2634\"\u003eIntegrated bleed \/ air purge features\u003c\/li\u003e\n\u003cli data-start=\"2637\" data-end=\"2677\"\u003eHigh-efficiency coolant flow control\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"2679\" data-end=\"2682\"\u003e\n\u003ch2 data-start=\"2684\" data-end=\"2706\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"2687\" data-end=\"2706\"\u003eWhat’s Included\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-start=\"2707\" data-end=\"2766\"\u003e\n\u003cli data-start=\"2707\" data-end=\"2766\"\u003eThermostat (seal\/gasket sold separately unless specified)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"2768\" data-end=\"2771\"\u003e\n\u003ch2 data-start=\"2773\" data-end=\"2812\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"2776\" data-end=\"2812\"\u003eWhen This Part Needs Replacement\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp data-start=\"2813\" data-end=\"2854\"\u003eReplace the thermostat if you experience:\u003c\/p\u003e\n\u003cul data-start=\"2855\" data-end=\"3033\"\u003e\n\u003cli data-start=\"2855\" data-end=\"2877\"\u003eEngine overheating\u003c\/li\u003e\n\u003cli data-start=\"2878\" data-end=\"2921\"\u003eEngine running below proper temperature\u003c\/li\u003e\n\u003cli data-start=\"2922\" data-end=\"2970\"\u003eFluctuating or unstable temperature readings\u003c\/li\u003e\n\u003cli data-start=\"2971\" data-end=\"2990\"\u003eDelayed warm-up\u003c\/li\u003e\n\u003cli data-start=\"2991\" data-end=\"3033\"\u003eReduced fuel efficiency or performance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"3035\" data-end=\"3038\"\u003e\n\u003ch2 data-start=\"3040\" data-end=\"3065\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"3043\" data-end=\"3065\"\u003eInstallation Notes\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-start=\"3066\" data-end=\"3325\"\u003e\n\u003cli data-start=\"3066\" data-end=\"3122\"\u003eReplace sealing O-ring or gasket during installation\u003c\/li\u003e\n\u003cli data-start=\"3123\" data-end=\"3182\"\u003eInstall with correct orientation (spring toward engine)\u003c\/li\u003e\n\u003cli data-start=\"3183\" data-end=\"3234\"\u003eInspect housing and cooling passages for debris\u003c\/li\u003e\n\u003cli data-start=\"3235\" data-end=\"3273\"\u003eBleed cooling system if applicable\u003c\/li\u003e\n\u003cli data-start=\"3274\" data-end=\"3325\"\u003eVerify operating temperature after installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"3327\" data-end=\"3330\"\u003e\n\u003ch2 data-start=\"3332\" data-end=\"3374\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"3335\" data-end=\"3374\"\u003eAlternate \/ Superseded Part Numbers\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003ch3 data-start=\"3376\" data-end=\"3404\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"3380\" data-end=\"3404\"\u003eOEM Cross References\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul data-start=\"3405\" data-end=\"3434\"\u003e\n\u003cli data-start=\"3405\" data-end=\"3434\"\u003eVolvo Penta: \u003cstrong data-start=\"3420\" data-end=\"3432\"\u003e21437904\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"3436\" data-end=\"3439\"\u003e\n\u003ch2 data-start=\"3441\" data-end=\"3458\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"3444\" data-end=\"3456\"\u003eShipping\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp data-start=\"3459\" data-end=\"3526\"\u003eShipping: Ships same or next day for fast Canada wide shipping. ⚓\u003c\/p\u003e\n\u003chr data-start=\"3528\" data-end=\"3531\"\u003e\n\u003ch3 data-start=\"3533\" data-end=\"3560\"\u003e💡 Parts Desk Insight\u003c\/h3\u003e\n\u003cp data-start=\"3561\" data-end=\"3727\"\u003eThese newer Volvo thermostats are designed to \u003cstrong data-start=\"3607\" data-end=\"3643\"\u003emanage air in the cooling system\u003c\/strong\u003e—if you’ve got temp spikes or inconsistent readings, this is often the root cause 👍\u003c\/p\u003e","brand":"VOL","offers":[{"title":"Default Title","offer_id":43563987566628,"sku":"21437904","price":99.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/fe361b65-c53a-468e-84d6-e420812d4bc0.png?v=1774384263","url":"https:\/\/marisolmarine.com\/products\/volvo-penta-thermostat-21437904","provider":"Marisol Marine Company","version":"1.0","type":"link"}