Description

The Cummins Thermostat 3802289 (alternate) is a precision-engineered diesel engine cooling component designed to regulate coolant flow and maintain proper engine operating temperature in Cummins diesel engines. This thermostat is a direct replacement for Cummins OEM part number 3928643 , serving as an alternate temperature-control option for specific cooling system configurations. Manufactured from high-quality, heat-resistant materials , the Cummins 3802289 thermostat is built to withstand constant temperature cycling, coolant exposure, and heavy-duty operating conditions typical of Cummins diesel applications. The accurately calibrated opening and closing points ensure efficient engine warm-up while preventing overheating during high-load operation. Designed for accurate fitment and OEM-spec thermal performance , this alternate thermostat helps protect critical engine components such as the cylinder head, engine block, oil cooler, and cooling passages. A properly functioning thermostat improves fuel efficiency, reduces internal wear, and supports consistent engine performance across varying operating conditions. Replacing the thermostat during cooling system service or an engine overhaul is strongly recommended to prevent overheating, restricted coolant flow, or temperature instability caused by worn or stuck thermostat components. 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.