My 2002 Grand Prix GT temp go's up and down. When im on the road its around 185 when I stop at a red light it go's up. Yes I know it will rise when stoped but if i sit for more than 2mins the temp go's to 216 then when I start driveing it go's back down. 216 seems a bit high and it happens whenever I am stoped. I also have a 180 t-stat and CIA is this normal.