Description

The Cummins Thermostat 3802273 is a precision-engineered diesel engine cooling component designed to regulate coolant flow and maintain optimal engine operating temperature in Cummins diesel engines. This thermostat is a direct replacement for Cummins OEM part number 3928642 , making it ideal for cooling system service, engine rebuilds, and complete overhauls. Manufactured from high-quality, heat-resistant materials , the Cummins 3802273 thermostat is engineered to withstand constant temperature cycling, coolant exposure, and heavy-duty operating conditions . The accurately calibrated opening and closing temperatures ensure the engine warms up efficiently while preventing overheating under load. Designed for accurate fitment and OEM-spec temperature control , this thermostat plays a critical role in protecting the cylinder head, engine block, oil cooler, and other cooling system components. A properly functioning thermostat improves fuel efficiency, reduces engine wear, and helps maintain consistent engine performance. Replacing the thermostat during cooling system service or an engine overhaul is strongly recommended to prevent overheating, coolant flow issues, and premature engine damage caused by a stuck or worn thermostat. This thermostat is commonly used in Cummins diesel engine rebuild, overhaul, and cooling system repair applications , including on-highway trucks, industrial engines, and heavy-duty equipment.