System for disinfecting or deodorising an automobile provided with such a system

The system (1) has a reservoir containing a deodorizing or disinfecting substance, and connection units for connecting a pneumatic energy production system (3) of a motor vehicle (2) with all or part of the reservoir. A pipe transports the deodorizing or disinfecting substance from the reservoir to substance spray nozzles arranged in a passenger compartment (18) of the vehicle, where the substance is conveyed in the pipe through compressed air generated by the pneumatic energy production system. A solenoid control valve controls spraying of the substance through the nozzles.