It was really cold this morning and my car sometimes makes a ticking noise coming from the fan whenever I first start the car up and put the defroster on max setting. I also noticed in the car while i was driving it there was like a buzzing noise was coming from it. But whenever I turned the setting down it went away. Just wanted to see if this was an issue because I have to take my car to the dealership to get looked at on Monday. 2004 GTS My check engine light came on and I have been driving it like that for two weeks. I thought it was the gas cap thingy but the dealership guy said it could be anything. What do u guys think?