I've had my AC off and auto works fine as long as I don't hit the defrost button. When it is on defrost blowers only the temp setting seems to be ignored and it gets really hot. Otherwise a setting of 70 keeps it perfect.
I have no squeaks, squawks, or rattles - thank God cause I hate them. I do every now and then experience the windshield hit by a rock sound and I've always wondered because I didn't think there was a rock.
Mine is almost unnoticeable unless I watch it on the dash. I'm fine with it so far. I can tell it is there if I try and quickly accelerate while in V4, there is a slightest hesitation. Not a problem though.
I've noticed mine is "cold" sensitive on mileage. It drops 2 MPG when the temps drop into the teens. It is also really sensitive to different gas. I just filled up in Rockwood and my mileage on this tank immediately dropped from 19.8 avg on the last tank to 17.6 on this one driving the same roads - wierd.......