Just to prove it happens to all of us, on my way home from a local car meet on one of my may checks of the gauges I noticed my temp higher than normal. On the highway the temp was high but still well below the red, in stop and go it got a little hotter. Got back home which was not far and let the car idle, aux fan was on temp gauge up and down as throttle was applied. As I was checking things out noticed the upper rad hose had no pressure and no flow seen at the expansion tank. A $16 thermostat was at fault, 10 min later it was fixed. This could be fatal boys! In the winter we see some t-stats stuck open and the result is no heat this is the first I have had on these cars stuck shut. It is easy to change 2 torx screws and do not take the hoses off the t-stat housing picks up with them attached, and minimal coolant loss if that is a concern. The cost is well behind that of an overheated engine!