04-08 must be different because driving down the highway no ac windows down on an hour road trip my temps were at 200+ wasnt beating on it. I used cruise control. I added a cooler in the summer I constantly check for leaks but my car sitting in traffic now for an hour on a 90 degree day. Won't go above 190 and in the winter I have no problems. So far it's hit 147 then when I hit a cruising spot will settle at 135