Solar Power Car Auto Cooler Fan Air Ventilation Vent System Radiator Black
The five stars is for what I purchased, not the product for sale in this listing.  Check out the Kulcar Solar Powered Panel Car Cooler Ventilator.  You can't get it at Amazon, I found it at Newegg.com.  Yes, it cost a lot but I got a product that keeps my new car's interior within 10-20 degrees F of the outside temp (tested and tracked with a digital thermometer that stores max temp).  I use it in conjunction with a high quality reflective and insulated windscreen shade.  The solar panel angle is adjustable