Originally Posted by bustedbenz

I can easily see preferring a 60 degree thermostat. Although our winters do get down to 0-10 F on the worst days, our summers get miserable. 90-95 air temp, 100-110 or higher coming off the asphalt... I've put better fan clutches, better fan blades, everything in my #14 SDL, and it still does its best to overheat given the opportunity in the summer. It also apparently hasn't got enough horsepower to climb a 7% grade with the a/c on - when I shut the compressor off, the temp goes to 100 and stops, when I leave it on it just keeps climbing until I get scared and back off and shut the air down. To me this suggests a barely-adequate cooling system... the 80* thermostat is new within a year or two, the radiator is new within two or three years... everything that can be replaced has been replaced, and the thing is just marginal for this climate. Having an extra 20 degrees advantage on the thermostat appeals to me, especially since hard interstate runs in hot summers defines my driving experience for most of the year.