1, the heater water valve of an automobile is a switch, which is connected with the engine in winter and closed in summer, in order to prevent the coolant in the engine from entering the heater water tank and avoid the temperature rise in the cab.
2. The thermostat is an element to control the water temperature of the engine. Generally, the engine water temperature is turned off below 87 and turned on above 87 (the coolant in the engine enters the radiator water tank, which means a big cycle.