Automotive air conditioning system with an electronic control unit

The vehicle heating and ventilation system comprises a fan (3) fitted with an electronic control unit (1). Manually adjustable louvers are fitted on the air ducts and sensors (S1 - S4) detect their degree of opening (B1 - B4). The unit is provided with a program which compares the actual air flow with a desired value input by a manual control (4) and adjusts the fan if necessary.