I was on my way to my mom's birthday party with my wife and kids when all of a sudden a car about 30ft distance pulls out in front of me giving me little braking distance causing me to hit his left rear door. My speed was about maybe 30mph. I checked to see if everyone was ok, which they were. I left the jeep on with ac because it was about 102 degrees outside. Meanwhile am talking with 911 operator my wife signals me over to tell me that the ac had stoped blowing cold and was now blowing hot air. So the cops came over and we talked and got that over with. So after the cops left and gave us both our paper work I drove home in the jeep(which is still drivable). The jeep had no hits under the hood. All of the impact was taken by the bumper. My question is why did all of a sudden did my ac stop blowing cold air???