I can't remember who it was (must have been at least 9 months ago), but someone did this in a very ghetto fashion. They ran a thick plastic tube back to the back (yep right across everything).
My best protection for my computer in the summer is I underclock my CPU. If I don't it will just keep overheating and reset. I've got my 2600+ underclocked to 1800+ for the summer.