This thermostat regulates the coolant flow in the engine cooling circuit of a harvesting machine. It opens at a calibrated temperature to allow coolant to circulate through the radiator, maintaining the engine within its operating temperature range. A stuck-closed thermostat causes overheating, while a stuck-open unit prevents the engine from reaching proper operating temperature, reducing efficiency. This original component is machined to the same thermal-response curve as the original assembly, ensuring the opening temperature matches the engine control system’s logic.