Need help finding vacuum leak!
 

I recently had an AOS fail on my 2005 boxster base w/ tiptronic about 800 miles ago and oil went all over the place. Now, I'm getting what sounds like a vacuum leak and I'm having the hardest time trying to locate it. It sounds like a loud, high-pitched "WEEEEEEEEEEEEEEEEEEEE" and is constant from when the engine starts till shut-off.

I suspect that it may have something to do with the transmission, as there is a very short break in the sound when the car shifts up or down and when the throttle is initially applied from idle.

Here is a youtube video which seems identical to my sound:
https://www.youtube.com/watch?v=L2Bh2Gpj2U8

It's running perfectly smooth otherwise. Smooth idle and acceleration with no CEL.

Bently manual was no help. Any help would be greatly appreciated.http://forums.pelicanparts.com/suppo...eys/yltype.gif

Answered my own question
 

found the leak. not surprisingly, it was right on top of the transmission.:)

http://forums.pelicanparts.com/suppo...s/a_frusty.gif

I used a rubber hose and a funnel to the ear to isolate the leak.

http://forums.pelicanparts.com/uploa...1428537345.jpg
http://forums.pelicanparts.com/uploa...1428537392.jpg

Now I just need to find a part number.

Best PN would be a section of hose and eliminate the 100 dollar plus subject to break and coolant loss cheap plastic part. Yust my take. I would never replace it again. Did it once.

Very good idea! This part has been used atleast since 1978 on the 928 and 944 as a heater control valve for coolant and is being used for ATF in our cars. Part #: 928-574-573-03

In researching, some guys over in the rennlist forum posted a metal alternative. Heres a pic and link for anyone interested but I like your solution better.
http://forums.pelicanparts.com/uploa...1428582612.jpg

Check your heater control valve or watch what can happen - Rennlist Discussion Forums

Could I cause any harm to my tiptronic tranny by removing that valve as you suggest?