I live in the midwest and during this summer of 2012, we have experienced extreme daily heat (99-107 degrees F).
My 9-5 Aero automatic usually performs flawlessly inside and out, but the heat has brought odd and annoying electrical problems:
There is a "bing-bong" noise that let's you know when there is a problem, which would be helpful if it didn't do it every minute or two; the gas gage fluctuates from completely empty back to the accurate reading while the TSC/off light is on despite pushing the button, and I have replaced the same headlight three times this year.
I love the car though.
I drove to NYC and was able to get 31.0 mpg, which is incredible with 230 bhp.
Reverse fog lights
31.0 mph highway
† Edmunds.com received the highest numerical score in the proprietary J.D. Power 2014 Third-Party Automotive Website Evaluation Study℠. Results based on responses from 3,381 responses, measuring 14 companies and measures third-party automotive website usefulness among new and used vehicle shoppers. Proprietary study results are based on experiences and perceptions of owners surveyed from January 2014. Your experiences may vary. Visit jdpower.com.