A lighting and/or signalling device for a motor vehicle comprising an outer wall delimiting the interior and exterior of a closed chamber, a casing, a closing glass closing the casing, the glass and casing forming at least partly the outer wall of the chamber, at least one light source inside the chamber, at least one heat exchange zone for transferring heat from inside to outside the chamber outer wall including the heat exchange zone, the heat exchange zone being able to be in contact with a fluid capable of circulating in the region of this heat exchange zone, so that the fluid enables heat emitted in the region of the heat exchange zone to be evacuated.