The present invention relates to an air conditioning system for an automobile and, more specifically, to an air conditioning system for an automobile comprising an expansion valve by integrating a first tube joined to an internal tube of an internal heat exchanger on one side of the expansion valve, and a second tube joined to an external tube of the internal heat exchanger, to form a single module and to have the internal heat exchanger be installed close to the expansion valve, thus enhancing the heat exchange efficiency. Moreover, by installing the internal heat exchanger close to the modularized expansion valve using bolts and nuts, the expansion valve can be prevented from being deformed by the heat generated from welding. By fixating the internal heat exchanger to the modularized expansion valve, a flange block and a coupling instrument for fixating the flange block to the expansion valve do not need to be assembled, thereby reducing the number of parts and man-hours.;COPYRIGHT KIPO 2014
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