Does the mini car have a heating valve? How to use it in what miniature?

If an old van without a front has no warm water valve, if a car with a water tank at the front now has a warm water valve, then the switches of the two models are the same, both of which are left and right toggle switches for heating and cooling in the car. . . The first type of cold and warm air switch in the car can only close the air duct of the warm water tank shell. . . Hot water is still circulating in the hot air tank. The second method is to close the water valve under the elevator in front. . After closing, the water in the warm air tank will not circulate, and the cold air will blow out.