I have a 95 gt 5.0 and when I sit with ac on car runs cool but when driving it goes to about half way up on temp gauge. Its alittle backwards I would think it would get hotter when sitting and cool down when moing . I have noe leaks or bad gaskets and new thermastat so Im stumped. I also have flushed system so Please help!!!! Also when ac off car stays cool when driving or sitting.