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I don't have a pic of it... I was wondering. What is that black metal tube that is attached to the firewall? Is it a passage way to run hose or wires through the firewall?

Thanks,
 

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Search this was covered in depth, I came across it a week ago. Just check all the pages in the speed section, I believe it was like 8 or 9 pages back so check a little past that.
 

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I believe it is a vent for the inside termostat. I think... can't really remember it was a while ago when I read it here.
 
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