Where is the switch valve of gtl heater in Ou Man?

On the center console, when the air conditioning system is started, turning the temperature knob to the red area will blow out warm air. Introduce the oil consumption of heating: heating air does not consume oil. If there is, there must be something wrong with the operation. The principle of warm air is different from that of cold air. The principle of cold air is that the compressor is driven by the engine during refrigeration, and the work of the compressor needs to consume the energy of the engine, thus generating extra oil consumption. The warm air does not need a separate device to work, but only needs to change the circulation route of the heated coolant into the car to generate hot air. Automobile water heating system: the heat source comes from engine coolant, and the water heating system is mostly used in cars, trucks and buses with low heating requirements. Water heating and warm air system is mainly composed of heater, hot water regulating valve, blower and control panel. The blower is composed of adjustable speed DC motor and squirrel-cage fan, which blows cold air to the heater and sends it into the car after heating. Adjusting the speed of the motor can adjust the air delivered to the frame.