Preconditioning system for a motor vehicle interior, said preconditioning system comprising: ° an infrared camera that has, in its field angle, at least one predefined zone (A, B, C, D, E) of the interior, ° a heating, ventilation and/or air-conditioning installation comprising at least one air outlet nozzle that is electrically steerable so as to allow a flow of air originating from the heating, ventilation and/or air-conditioning installation to be redirected towards one or more predefined zones (A, B, C, D, E), ° an electronic image processing and analysis device connected to the infrared camera and configured to: • determine temperature values of each of the predetermined zones (A, B, C, D, E) from the images from the infrared camera, • compare a first time (Td), corresponding to a time defined by the user to perform the preconditioning, and a second time (Tn), corresponding to the minimum time needed to bring the temperature of one or more predefined zones (A, B, C, D, E) to an associated target temperature, said second time (Tn) being determined as a function of the measured temperature values of said predefined zones (A, B, C, D, E) and as a function of the target temperatures associated with each predetermined zone (A, B, C, D, E), • drive the heating, ventilation and/or air-conditioning installation and steer the at least one air outlet nozzle towards one or more predetermined zones (A, B, C, D, E) so that the at least one predetermined zone (A, B, C, D, E) approaches or reaches its associated target temperature within the time interval of the first time (Td). ° an infrared camera that has, in its field angle, at least one predefined zone (A, B, C, D, E) of the interior, ° a heating, ventilation and/or air-conditioning installation comprising at least one air outlet nozzle that is electrically steerable so as to allow a flow of air originating from the heating, ventilation and/or air-conditioning installation to be redirected towards one or more predefined zones (A, B, C, D, E), ° an electronic image processing and analysis device connected to the infrared camera and configured to: • determine temperature values of each of the predetermined zones (A, B, C, D, E) from the images from the infrared camera, • compare a first time (Td), corresponding to a time defined by the user to perform the preconditioning, and a second time (Tn), corresponding to the minimum time needed to bring the temperature of one or more predefined zones (A, B, C, D, E) to an associated target temperature, said second time (Tn) being determined as a function of the measured temperature values of said predefined zones (A, B, C, D, E) and as a function of the target temperatures associated with each predetermined zone (A, B, C, D, E), • drive the heating, ventilation and/or air-conditioning installation and steer the at least one air outlet nozzle towards one or more predetermined zones (A, B, C, D, E) so that the at least one predetermined zone (A, B, C, D, E) approaches or reaches its associated target temperature within the time interval of the first time (Td). • determine temperature values of each of the predetermined zones (A, B, C, D, E) from the images from the infrared camera, • compare a first time (Td), corresponding to a time defined by the user to perform the preconditioning, and a second time (Tn), corresponding to the minimum time needed to bring the temperature of one or more predefined zones (A, B, C, D, E) to an associated target temperature, said second time (Tn) being determined as a function of the measured temperature values of said predefined zones (A, B, C, D, E) and as a function of the target temperatures associated with each predetermined zone (A, B, C, D, E), • drive the heating, ventilation and/or air-conditioning installation and steer the at least one air outlet nozzle towards one or more predetermined zones (A, B, C, D, E) so that the at least one predetermined zone (A, B, C, D, E) approaches or reaches its associated target temperature within the time interval of the first time (Td).