Hi I just got a 2002 elantra the other day and there's a rattling noise present when the car is started but goes away after a while. I had someone check it out and they said that it's the AC because it hasn't been ran all winter. Well when the AC is turned on, it goes away. I'm assuming there's some kind of rust around it. It doesn't affect the way the car drives, it just makes a really annoying noise. I'd just drive around with AC on but when it's 20 degrees outside, it's not an option lol. Any ideas? Thanks.