I noticed my car starting to smoke a while ago when I had the AC on and was in reverse to park. I had it checked out and drove it for a while, was told it was nothing since they couldn't get it smoking. I was driving it again recently without the AC on and once again put it into reverse to park it and noticed white smoke coming up from under the hood. I am clueless as to what can be causing it, and since it doesn't smoke when I take it to get checked, I can't get an answer.