I just got my first WRX a few days ago. It was fine the first few days but yesterday I started noticing some whining when I turn the wheel all the way to the left or right the power steering pulley will also seize up and it seems to be a little stiff compared to my other cars. I got a full power steering flush. It seemed to help a bit but now I have noticed it really only whines when the AC is on. If the AC is off I don't get a whine. What could it be?