I have a 90 Seville. It normally runs at 203 if I keep moving with the ac on. However if I get stopped in traffic it heats up pretty quick. It has gotten to 230. I have read in a few threads about people replacing the thermostat with a 180 or a 160. Is this safe? Is there a downside? I live in Florida and maybe the temp range is ok but it seems hot compared to my previous vehicles. Any help would be great.