Is the throttle closed during the small engine cycle?

The throttle valve is closed during a small engine cycle. The function of engine coolant is to maintain a certain temperature through the infinite circulation of the water pump and to dissipate heat to the radiator, so that the engine can work normally at a certain temperature. If the coolant temperature is too low, the thermostat will close. After shutdown, the coolant can only circulate in a small way, and the small circulation will not dissipate heat through the radiator, so the engine temperature will rise rapidly.