You can get some additional cooling for any A/C or non-A/C car through
http://www.roshgo.com they make several things that can help out. I ordered their Kooleraire portable unit that is basically a lid the replaces the original lid on either a Igloo 25 qt or Coleman 28 qt cooler. Their unit has a fan that sucks air in over the ice and a vent that it blows out of....kind of like when I was a kid the vast majority of us did not have a/c and simply placed pans of ice in front of a fan blowing towards us. Their unit plugs into the lighter socket....I bought one to use both in my non-a/c Meto and at the drag strip in the car I race....I always have a cooler with me anyhow for drinks and food, now it can do double duty. They also have a universal fit kit to use on up to 72 qt coolers! I wish I had known about them many years ago....and even when I was a letter carrier....on days of lots of sunlight the interiors of those trucks would be over 135 in shaded areas!
They also make a seat cover that sucks air in through a vent and blows it out the entire seat nd back area....I imagine someone could take both products and hook a hose up from the kooeraire to the seat!
They use a 100 cfm fan and the air blown out is @ 50 degrees.