AIR CONDITIONING SYSTEM FOR VEHICLE

Disclosed herein is an air conditioning system for a vehicle which includes an air-conditioning module having an air-conditioning case (110), which has a cold air passageway (111) and a warm air passageway (112) partitioned from each other, and a blower unit (130), and an indoor air inflow duct (143) for introducing indoor air of the interior of the vehicle into the blower unit (130), wherein an outlet (110b) of the air-conditioning case (110) and an inlet (143a) of the indoor air inflow duct (143) are arranged to be adjacent to each other, so that the air conditioning system for a vehicle can be installed through just one through hole part (310) formed in a dash panel (300), thereby enhancing assemblability and reducing weight and an installation cost.