Method for dehydrating evaporator of air conditioner of vehicle

A method for dehydrating an evaporator of an air conditioner in a vehicle, comprising:

• a) determining, by a controller of the air conditioner, whether a voltage of a battery is equal to or larger than a predetermined reference voltage after an engine is turned off;
• b) checking, by the controller, between a time when the engine is turned off and a time when the engine is restarted, whether the evaporator of the air conditioner has been turned on or not before the engine is turned off;
• c) driving, by the controller, between the time when the engine is turned off and the time when the engine is restarted a blower motor and sensing humidity of blown air using a humidity sensor, when it is determined, by the controller, that the voltage of the battery is equal to or larger than the predetermined reference voltage in the step a) and when it is checked that the evaporator of the air conditioner has been turned on before the time when the engine is turned off in the step b);
• d) determining, by the controller, whether the humidity sensed at the step c) is equal to or larger than a predetermined reference humidity;
• e) setting, by the controller, a mode change period between a defog mode and a vent mode and a drive voltage of the blower motor, depending on the sensed humidity, when the sensed humidity is equal to or larger than the predetermined reference humidity at the step d);
• f) changing, by the controller, an air conditioning mode into the vent mode, and applying the set drive voltage to the blower motor, depending on conditions set at the step e), thus drying the evaporator;
• and
• g) determining, by the controller, whether the mode change period between the defog mode and the vent mode is reached during the step f), and converting the vent mode into the defog mode when the mode change period is reached, thus circulating a control to the step c).