The function of automobile air conditioning heating system: 1, heating: it is cold in winter, and people feel colder in the driving car. At this time, the car air conditioner can provide heating for the car to increase the temperature inside the car and make the members no longer feel cold. 2. Defrosting: In winter or early spring, when the indoor and outdoor temperature is high, the window glass of the car will frost or fog, which will affect the sight of drivers and passengers and is not conducive to safe driving. At this time, warm air can be used to remove the frost and fog on the glass.