Not Cool!
Totally agree with memike about the 160 degree t'stat. It stays open all the time..........The fluid needs to sit in the radiator awhile to cool. Try a 185 t'stat and if you can, get a shroud, that is also good for 10 degrees or so.
And just so you know, I live in the bloody hot desert....105 today:sunny:
Be kewl.........8)