Hi and thanks for using 2CarPros.
That is an interesting one. Can you upload a picture of it? Also, based on your description, it almost sounds like a crankcase ventilation unit. Being that is located on top, I do not think it would be an overflow.
Take a look at the picture I found online. Tell me if that looks like the part. If it does, it is for crankcase ventilation.
Let me know.
Joe
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Sunday, November 25th, 2018 AT 6:54 PM