Hey I'm gabriel and I'm new to the form. I'm Having problem with my Hummer H2 it seems to be over revving. Like about three month ago it was having trouble starting. And I thought it was no big deal, But I noticed that my temperature gauge wasn't working And my car was at 1000 RPM. But this problem comes and goes ones in a blue moon. Now my hummer is doing it ever day and I also Notice that my AC is not working to good. Can someone please help!!!