Motor vehicle comprising headlights and an air conditioning system fluidically connected to the headlights for supplying an air flow thereto, and comprising an electric fan to generate the air flow, an electric heater to heat the air flow generated by the electric fan, a sensory system to measure air temperature and moisture inside the headlights, an electric heater and an electric fan arranged inside each headlight, and an electronic control unit connected to the sensory system to receive the measured quantities, to the electric fan and the electric heater of the air conditioning system, and the electric heaters and the electric fans in the headlights to control operation thereof. The electronic control unit is further designed to carry out one or more of the following headlight defogging/defrosting operations based on air temperature and moisture inside the headlights: a) operating in a timed manner, with internal combustion engine off, the electric fans in the headlights; b) operating in a timed manner, with internal combustion engine off, the electric heater of the air conditioning system and, simultaneously, the electric fan of the air conditioning system or of the electric fans in the headlights; and c) operating in a timed manner the electric heaters in the headlights.