become a magnifying glass . Security shade may help. Assuming interior is charcoal, along with dark exterior, leave tops on. Set climate control to auto using max temp. which will still be less than ambient, and let A/C do it's thing. Cycle auto & econ as desired. If stops are required, open hood to minimize "heat soaking" engine bay. Couple neck towels in ice chest, connect hooka-pipe to cool suit & "Enjoy the Ride" !!