Regardless of where you live, the weathermen seem to be offering the same warning: It’s going to be a scorcher. We’ve seen heat waves hit nearly every part of the globe this summer, and despite coming off one of the most brutal winters on record, we’re already tired of the heat and humidity here in Boston. Being in the northeast, central air conditioning isn’t a given. However, unless you paid Porsche for a new Boxster Spyder, you’ll most likely be able to find some relief in your car.