I have a 2011 Buick Lacrosse. Since the purchase 4 months ago, and I've had it in the shop 3 different times. I've has the the steering column replaced, the cadillitic converter replaced, and not it's makes some weird whistling sound that seems to be coming from the front dash area. I even hear some rattling coming from the engine. The engine light is not on, so they can't tell what's wrong. I explained the noises, and they tell me I need to come in. I'm frustrated. I love the car, but I'm beginning to think I have a lemon. Anyone else have these issues?