I was driving to work today and when I arrived, and put the car in park, I noticed that I had white smoke coming from underneath the hood of my car. I have a 2000 Infiniti I30. Can anyone tell me what this might be and how much I may end up paying to fix it? I just purchased the car used. Also, the temperature thingy didn't go up to HOT, so I don't know. It was just normal... right in the middle of hot and cold. Please advise...