Cummins 3974823 Diesel Engine Cooling Thermostat is a replacement thermostat for Cummins diesel engines, identified by the part number 3974823. It regulates coolant flow between the engine and radiator to help maintain the engine at its intended operating temperature and prevent overheating. As a Cummins cooling system component, it is designed to fit Cummins diesel engine applications that require this specific thermostat.
