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I am experiencing a drastic coolant leak. It is coming from some box in the side of my Tiguan engine block. The picture is behind and slightly above the coolant after run pump. I do not know what the black box is but it is about 6 inches long and attached flush with the engine with only one sensor going into it, otherwise it has nothing that I can see running into or out of it, no identifying marks. I cannot find the part referenced anywhere and need to buy a new gasket I would imagine. If someone else has experienced this please let me know their solution as I have never experienced this before.
 

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I have the same issue. Any fixes? The black box is the secondary oil seperator. To my knowledge no coolant should be going through there.
 
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