Where is the water valve of Komatsu 240 heater?

Between the main engine water tank and the warm air water tank. You can find it by connecting the water pipe of the heater box along the main water tank of the engine. Komatsu 240 warm water valve is between the main water tank and the engine warm water tank. The warm air water valve is the warm air switch of the automobile heater. The working principle of the automobile heater is that the radiator in the heater is connected with the circulating water of the engine through the inlet and outlet water pipes, and the water valve is a switch.