So I heard a loud, obviously innapropriate sound coming from my 2005 MCS and I'm trying to find out what it is for sure.

I'm 99% sure it is the power steering fan, and to test it out I started my car and recorded the sound coming from the power steering fan after turning on the A/C. I was unable to find a good video depicting this sound, so hopefully this one will help.

I posted the video on YouTube so take a look and see what you think please.

http://www.youtube.com/watch?v=JTl6DSlSJo4&sns=em

 

For anyone who might be interested, I removed and cleaned the fan and that fixed the issue.

Here are some links of the rest of the process:

Part 2 - Manually operating uninstalled, dirty fan
http://m.youtube.com/#/watch?v=mc57u_AuuPI

Part 3 - Manually operating uninstalled, cleaned fan
http://m.youtube.com/#/watch?v=u6SN30705ec

Part 4 - Cleaned fan reinstalled, running, no noise
http://m.youtube.com/#/watch?v=78-XK04EMbU

Thanks, hope this helps someone.