once you get the system working, there are some things you can do help it stay cool. I am only a few hours east of you and the heat is brutal here, too. these early systems were a bit anemic when new, but can be helped by using a front windshield shade when parked in the sun, tinting the windows with a dark aftermarket window film, and painting the roof of the wagon white. that last one may seem a little drastic, but will seriously affect the interior temp.