Any help would be greatly appreciated, ok my son has a 1999, yes a 1999, Chevrolet trailblazer. We are trying to find out where a vacuum line goes. It's coming from the firewall in the middle. There is something mounted there that has an electrical connection to it plus 2 vacuum lines. The vacuum line on top is the one we need to know where it goes. There is also another vacuum line coming from the door jam above the top hinge, but it looks like a previous owner drilled the hole and ran the line. No clue where it came from or where that one goes either. Like I said, any help would be greatly appreciated. Thanks.

Need to know where the top vacuum line goes.
this is the vacuum line coming from driver's side door above the top hinge.

1999 Chevy Trailblazer

 

The 1999 Trailblazer was an upgrade version of the S10 Blazer. It was not yet a truck on it's own. The part you pictured, I found one on Rockauto that looks like it and is listed as a vacuum motor.

 

Thanks, any idea where it goes ? We've looked and can't find it.

 

Thanks, any idea where it goes ? We've looked and can't find it.

 

on most vehicles the firewall vacuum lines goes either to the source (intake manifold, checkvalve and tank), or to the heater water valves.

 

Is it a 4X4? It appears to have something to do with 4 wheel drive transfer case.