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I think it is

TUBE. ENGINE COOLANT.

Part Number 12592926

I purchased a replacement as I suspected it was leaking round the O ring. It did not help so I ended up using some gasket seal between it and the metal block which seems to have done the trick.
 

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Thanks, that is what I came up with as well. It stinks, if yours still leaked. I bought the tube today at a local Chevy service center Part # 12590844 and hope it fixes it.
 
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