we own a 2007 pontaic grand prix 80,0000 miles for the past 8 months started back in 2011 august vehical started to over heat. auto went to dealership and the heads wher sent off to machine shop and motor taking apart and put back together 3 months later samething again and 3 months later same thing and 1 month later same thing ,know is just that something not right with what is going on or dealership just not looking into the real problem if anybody reads this make sure the dealership u attend for service is a top of the line service department........