The whistling teapot sound has gone away, YEA! Why?, I have no idea. I brought the car back to my independent mechanic, we reviewed the comments from everyone, looked around for the noise for about an hour and continued to scratch our heads. I made an appointment to bring the car back in within the next week with the plan to take it apart. The noise had been present for over a month and I drove the car everyday. Then two days before the scheduled appoitment the noise completely disappeared! I can only guess that it was a seal that eventually sealed itself up. It's either that explanation or the fact that it overheard my wife that if the car didn't improve she was determined to sell it.