hello everyone i'm new to this forum. just purchased 2001 2.7 t and already have a problem with the temp gauge. when the car is running everything is normal and the gauge is in the middle. then i turn the car off and put the key back in the ignition but don't actually start it.i just turn the key to the point where all the cluster lights go on and all of the sudden the temp gauge goes almost to the red . then i turn the car on again and after maybe 30 sec. it goes down to half and stays there. is this something i should worry about? thanks alot