So I've noticed that my 2010 F4 runs very hot. First of all, I see the temp gauge, how do I tell what the actual temp is? I've read many threads on this site about the F4 overheat issue, but most of them are referring to older models. Do I need to purchase the impeller upgrade or could there be something else wrong? Yes I'm a total NOOB, I did read this site for an hour before I started this new thread.