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The function of the automobile air conditioning evaporation box is to make the low temperature condensate liquid through the evaporation box, heat exchange with the outside air, gasification and heat absorption, to achieve the effect of refrigeration. The role of automobile air conditioning: 1, the use of refrigerant continuous abnormal cycle to achieve refrigeration effect; 2, remove the dust, odor, flue gas and toxic gas in the air of the car, make the air inside the car become fresh, humidify the air inside the car, improve the relative humidity of the air inside the car. Automobile air conditioning use and maintenance methods are: 1, the temperature is not too low; 2. Control the direction of the outlet; 3. Don't use it for a long time. 4, properly open large air volume; 5. Turn off air conditioning when driving at low speed.