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Open the bonnet look at the engine cover, the blow off valve or dump valve is located behind the cover around the centre of the back edge of the plastic cover.

It is a small round black cylindrical plastic device that fails very often, so is always worth replacing with say a Forge DFV100, which is a much more efficient and prettier looking device.

If yours makes a 'fluttering' sound when the engine is first revved and then released, it needs replacing!

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14y ago
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Q: Where is my blow off valve and wastgate on a 04 vw golf gti 1.8t?
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