Quote:
Originally Posted by Jamesp
JFP I'm a Boxster newbie and about to replace my AOS. I don't want to make a mistake, so can you explain how the AOS works so I know what I am doing? Thanks.
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The AOS basically functions much like a PCV system that separates the oil vapor and liquid from the vacuum stream entering the engine to be burnt. It is mounted on the passenger side of the engine near the bell housing:
It has multiple vacuum lines running off it, and there have been updated designs released over the years. Some of the later M96/97 engines had AOS units that had water passages in them as well.
As these are a common maintenance replacement item, there are several DIY write ups on how to do it, which is not hard, but it can be time consuming, and requires using a cable operated hose clamp tool to save your sanity. The following site will provide a useful introduction to the sport, but do a search as several write ups also include some hints on how to streamline the replacement if you are working on the ground:
https://sites.google.com/site/mikefocke2/airoilseparatorreplacement