{"product_id":"thermostat-switch-sensor-3408643-3915945-for-engine-4b3-9-6b5-9-b4-5-b6-7s-4-5","title":"Thermostat Switch Sensor 3408643 3915945 for Engine 4B3.9 6B5.9 B4.5 B6.7S 4.5","description":"\u003cstrong\u003eThis Thermostat Switch Sensor is a temperature control sensor compatible with Cummins 4B3.9, 6B5.9, B4.5, B6.7S engines and matches OEM Part# 3408643 and 3915945.\u003c\/strong\u003e\u003ch2\u003eProduct Overview\u003c\/h2\u003e\u003cp\u003eThe Thermostat Switch Sensor 3408643 3915945 is a critical component for engine temperature monitoring in Cummins diesel engines. It ensures precise temperature control for optimal engine performance and efficiency. This sensor is designed for use in heavy-duty applications requiring reliable coolant temperature sensing.\u003c\/p\u003e\u003ch3\u003eKey Features \u0026amp; Performance\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eDirect replacement for OEM part numbers 3408643 and 3915945\u003c\/li\u003e\n\u003cli\u003eCompatible with Cummins 4B3.9, 6B5.9, B4.5, B6.7S and 4.5 engine models\u003c\/li\u003e\n\u003cli\u003eHigh-quality construction for accurate temperature sensing and durability\u003c\/li\u003e\n\u003cli\u003eEasy plug-and-play installation with factory connectors\u003c\/li\u003e\n\u003cli\u003eRigorous testing ensures reliable performance under extreme conditions\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment \u0026amp; Compatibility\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eCummins 4B3.9 engine\u003c\/li\u003e\n\u003cli\u003eCummins 6B5.9 engine\u003c\/li\u003e\n\u003cli\u003eCummins B4.5 engine\u003c\/li\u003e\n\u003cli\u003eCummins B6.7S engine\u003c\/li\u003e\n\u003cli\u003eCummins 4.5 engine\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e\n\u003cstrong\u003ePart Number(s):\u003c\/strong\u003e 3408643, 3915945\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e What is the function of this thermostat switch sensor?\u003cstrong\u003e A:\u003c\/strong\u003e It monitors engine coolant temperature and sends a signal to the engine control unit to regulate cooling fan operation and maintain optimal operating temperature.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Is this sensor compatible with all Cummins engines?\u003cstrong\u003e A:\u003c\/strong\u003e It is specifically designed for Cummins 4B3.9, 6B5.9, B4.5, B6.7S and 4.5 models; verify your engine model before purchase.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eProduct appearance and specifications may vary slightly by batch. Compatibility may vary by serial number. Verify fitment before purchase.\u003c\/em\u003e\u003c\/p\u003e","brand":"DURAFORCE","offers":[{"title":"Default Title","offer_id":53677969244433,"sku":"ZZ2Z00920","price":61.69,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0250\/2446\/2929\/files\/1_a7f9036f-5498-4efc-882f-b086e8b8bbd6.jpg?v=1781613412","url":"https:\/\/www.duraforce.com\/products\/thermostat-switch-sensor-3408643-3915945-for-engine-4b3-9-6b5-9-b4-5-b6-7s-4-5","provider":"DURAFORCE","version":"1.0","type":"link"}