The present invention is installed a blower fan which relates to a vehicle air conditioning system, and more particularly, is installed in the refrigerant line between the water-cooled condenser and the expansion valve, the flow of air to the refrigerant to the air-cooled condenser and the air-cooled condenser for heat exchange with air and, in a state arranged in series to the air-cooled condenser and a ventilation fan in the flow direction of the air, but disposed on a side of the water-cooled condenser, by configuring so as to disposed in the one side width of the water-cooled condenser, using the width of the water-cooled condenser it is possible to place the air-cooled condenser and a ventilation fan in the width, so simplified and reduced to improve jangchakseong and assemblability in the engine compartment package (package), the noise of the arrangement the ventilation fan is in between the blowing fan group of two air-cooled heat exchanger in addition, even if a reduction and also run out of air entering as idle (idle) conditions Can secure a sufficient cooling performance, In addition, since enough of the liquid phase refrigerant flows into the receiver dryer as install the air-cooled condenser can be secured to the receiver drier inherent features as well as take advantage of the air-cooled condenser in sub-cooled region it will be on the automotive air conditioning system to improve air conditioning performance.