I notice on very hot days (95+) the air conditioner on my Durangos (Had 2) would take about 10 minutes of driving on the highway to get very cold, regardless of using auto or Max AC setting. Will not get cold idling in a parking lot. Stop and go driving would keep it from getting very cold too. I had the same issue with an E class Mercedes Benz afew years ago. I drive a Ford for work, both Crown Victoria and Explorer. The Ford's AC gets super cold at idle in a parking lot. Diamler/Chryslers not so much. Anyone notice this?