Letter from constituent regarding his wife 2013 chevrolet volt, who having issues with the hvac system not cooling the rear seats when the temperature was near 100 degrees; requesting that gm accept the return of the vehicle and purchase price be refunded.*sd the consumer stated the windows would fog up whenever humidity was present, the navigation system, was reading the vehicle was in detroit, the re-generative braking system and acceleration had downgraded after the last software update.*jb