Unplugged engine?

Stefan

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I'm in the nice stage to connecting all wires and hoses to engine for the first time. (PO dismantled the hole car). Cables (specially injection) are way to stiff and passed "best before date" but that's another issue.

Now to the question!
I've some problem with cooling hoses from "shuttle trottle" (CSi) I've noticed there are two threaded holes on each side (rear) at engine housing. Which one to be connected with "shuttle trottle" and should the other one just be plugged?
 
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