I bought this car in the beginning of January and have a little problem. Sometimes, my heat doesn't work and blows cold air and at the same time, my temperature gauge decreases and goes below normal temperature. After a little while, the temperature goes back up and I hear a little type of boiling sound and the heat starts to blow again and the temperature raises back to normal. I have researched for answer, however, none of them have been helpful. Anyone here that has any answers would be greatly appreciated. Thank you very much.