Where is the heater valve of Longgong 50 forklift?

Between the main engine water tank and the warm air water tank. The heater valve of Longgong 50 forklift truck is located between the main water tank and the engine heater box. The warm air valve is the warm air switch of the automobile heater. The warm air working principle of the heater is that the radiator in the heater is connected with the circulating water of the engine through a pipeline.