return pipe, the warm air tank of Wuling 1.5 engine, is usually connected to the circulation system of the engine. The function of the return pipe of the automobile warm air water tank is to raise the engine temperature, so that the engine can enter the normal working temperature range more quickly, thereby reducing the wear of the engine and improving the working efficiency of the engine. If the heater tank return pipe breaks down, it is recommended to go to the auto repair shop for repair in time.