Where is the engine warm air return pipe of Futian Aoling Express?

The engine warm air return pipe of Futian Aoling Express is under the water tank. Futian Aoling Express will find the warm air valve along the water pipe connecting the main engine water tank and the warm air water tank. The warm air valve is located between the main engine water tank and the warm air tank, and the warm air return pipe is located at the lower part of the water tank. The heating water pipe is a pipe that brings the heat of the engine to the car through the water in the car water tank to keep the car warm.