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Originally Posted by Boxtaboy
My friend helped me install a new AOS yesterday on my 01 with 65k miles. My old AOS wasn't acting up or anything, but we did it as a precaution. It was only $88 from Sunset Porsche, so not really expensive to replace if you do it yourself.
The new AOS has an updated multiple o-ring seal which is much more substantial. You can sorta see on the pic below of my old AOS that it only had a small single o-ring seal (top left on that tube):
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When mine failed there was no smoke. When the engine warmed to 185 degrees it would start a whistle screaching sound. It was air being forced out out the front seal which could have blown out the rear seal...not that's pressure.