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pete1 said:
The AWM part is more $$. No need to replace, just flush it out and reuse it. It's not really a valve, it's more of a mini catch-can.

In addition, there is a "real" PCV valve located under the manifold. Look for part #6 in these pictures...

http://www.peteandmichelle.lunarpages.com/b5/PCV-1998-2000.pdf
http://www.peteandmichelle.lunarpages.com/b5/PCV-2001-2002.pdf
http://www.peteandmichelle.lunarpages.com/b5/PCV-2003-2005.pdf

The "real" PCV valve does most of the work when the manifold is under vacuum. The "puck" near the airbox really only vents crankcase air when the manifold is under pressure.
Pete, what about #25 in the 2003-2005 file?
 

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#25 in the 2003-2005 file looks like a standard-issue check valve (like the other three or four check valves in the vac lines around this area). You probably only have #25 if you also have #6A instead of #6. I'd bet it's not a us-spec option. :)
 

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I can't believe it took so long for someone to mention the small valve under the manifold, thanks pete1. Like pete1 wrote, the puck itself is for keeping the turbo from sucking a buncg of oil out of the pan, or conversely, to vent air when under boost. I changed it at ~125,000 , don't know the recommended interval but your owner's manual/Hayne's/Bentley should.
 

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Here is my and my car's contribution to this thread:









There was almost a teaspoon-ful of that crud which I got out of that puck in dry form. Then I used Throttle Body cleaner spray into the valve, closed the both ends and shook it a few times to get more dissolved and smaller particles out. I repeated it quite a few times and finally air dried it first with a compressed can and then naturally while I was cleaning the Throttle Body itself. Then installed it back in.
 

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WOuld the 'REAL' PCV valve please stand up.

The AWM part is more $$. No need to replace, just flush it out and reuse it. It's not really a valve, it's more of a mini catch-can.

In addition, there is a "real" PCV valve located under the manifold. Look for part #6 in these pictures...

http://www.peteandmichelle.lunarpages.com/b5/PCV-1998-2000.pdf
http://www.peteandmichelle.lunarpages.com/b5/PCV-2001-2002.pdf
http://www.peteandmichelle.lunarpages.com/b5/PCV-2003-2005.pdf

The "real" PCV valve does most of the work when the manifold is under vacuum. The "puck" near the airbox really only vents crankcase air when the manifold is under pressure.
I have held back on replacing valve cover gasket until I look into all this. So I am researching what parts I can clean and which I am better off just replacing for my 99 AEB 1,8T. By the way the links above are dead. Would be really helpful if anyone knew where I could find a parts list in one place.

Anyhow as I research and put together a list of individual parts which is the 'REAL' PCV valve. I can't figure it out and there's no such thing in ETKA
 

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ETKA calls it a Bleeder Valve (part #6).

http://hubpages.com/hub/The-Positive-Crankcase-Ventilation-System

With our turbocharged engines the system is a little more involved because the Intake Manifold isn't always under vacuum. Sometimes the IM is under pressure (boost).

The bleeder valve is located in the plumbing under the IM. On the older 1.8t engines, a lot of the parts in that plumbing like to break when you go to disassemble them.



http://www.passatworld.com/forums/showthread.php?t=196909

http://www.ecstuning.com/Volkswagen-Passat_B5-FWD-1.8T/Engine/Intake/Breather_Hoses/
 

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Thanks Steve in Chicago,

Just finding this out across a couple of threads and ECS listings including the ones you mention. I also couldn't at first 'see' the bleeder valve which I could 'see' in ETKA but see it now covered mostly by hoses and clamps. I was looking for something more substantial.

Do you know however why in our turbo engines (1999 AEB), the vent or breather tube (#10) looks different and rises up in an S shape to connect with a suction pump (058133753B now D) and is the suction pump what you guys call a vacuum booster?

* EDIT just found that the difference in shape of breather or vent tube (#10) is the one depicted in ETKA is for manual transmission and the other one which is not depicted, is for automatic transmission
 
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