Car star steam-powered exhaust motor vehicle Cool Ventilation Fan runs on the sun's power - no electricity or batteries required. going in a hot automobile is perhaps the last item you wish to try to to on a hot summer day. however during this day and age, you'll be afraid to go away your windows cracked or rolled down. that is wherever the motor vehicle cool comes in. it is a star steam-powered device that's alleged to keep your automobile cool. The vent installs in seconds on windows of all vehicle makes and models.