Might have to "Burp" the coolant system.... try drilling a small hole in your thermostat to allow the air to work itself out. I once had a 2002 Grand Prix that took me an hour to get the air out of the cooling system, and temps kept climbing, finally got it done, what a chore. but, as someone else mentioned earlier, 180 degrees isn't bad at all, but with an outside temp of 90 to 100 ambient temperature, I'd be looking at some auxiliary cooling myself.
Ben
__________________
"Persistence is the twin sister of Excellence.one is a matter of quality,the other, a matter of time"

“Serious Black” my 1971 Short Bed Fleetside Sold to
an outstanding man in Lees Summit,Mo. “Gone, but by no means,Forgotten”