mya4audrey

One day my Air-conditioner was making a funny sound and all of the sudden no air was coming out at all on full blast. You could hear it but no air was actually coming out of any of the vents. So, I called immediately and scheduled an appt for my car. Later that day, it began to work, but now the problem is when I turn off the unit and I am driving on the freeway, it blows all kinds of air as if it were on full blast. When I use the little wheels on the vents to close them it makes a loud whistle type sound. Anybody know what this could be? I told audi after I took it in a month later for oil change and they told me the system was working properly...well it didn't do that before..any ideas?
My car is a 2008 A4 with 42k.
Thanks for any info!!