Motor vehicle having a drive unit and a storage for a working fluid

The vehicle has a drive device with at least one waste heat functional unit (16) and a storage device (14) for a working medium that interacts at least partly with the waste heat functional unit to heat the working medium. The waste heat functional unit is an exhaust gas transport system (20), a cooling circuit system (18) or part of an internal combustion engine system (10) and/or part of a fuel cell system (12).