Motor vehicle with a water box and air conditioning system

The motor vehicle (1) has a passenger compartment (40) and an air conditioner (15), which is connected with a water tank (6). An air inlet opening (7) is provided to intake the fresh air in the air conditioner, where an air outlet (38) is connected to and from a bottom wall (28). A portion (321) is located in an interior space (32) of air downstream of a water outlet opening (24), where another portion (322) is located in air upstream of the water outlet opening. The former located portion of the air downstream of the water outlet opening is directly connected to the passenger compartment.