This thermostat regulates the coolant flow in the engine cooling circuit, maintaining the operating temperature of the host tractor. It opens at its rated temperature to allow coolant to pass through the radiator and closes when the engine is cold to speed warm-up. A failed thermostat stuck in the open position prevents the engine from reaching operating temperature, causing poor fuel combustion and increased wear. A unit stuck closed leads to overheating. This component is manufactured to the original spring-rate and opening-temperature specifications, ensuring the cooling system maintains the correct thermal balance for the engine.