Originally Posted by
guile
it took me a while to work out how to remove the top hose fixing but managed to do it without braking anything which was a good result. it looks really weird inside, i wonder if they ever need emptying / changing...
Under the foam is some activate carbon granules. Eventually they saturate. I have seen a forum post where the guy cuts the top off and burns the granules to "release the impurities" and then he glued it back together. I think they are around $50 on ebay. VW AU probably want $300.
There should be a mesh filter about 25-30mm diameter (maybe on the hose) - it might need a clean with solvent
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I used to think I was anal-retentive until I started getting involved in car forums
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