I'm in the process of replacing all of my coolant and vacuum lines in my 97 850 glt, but about halfway through I noticed a very small metal line with the remnants of a vacuum hose connected to it. I have all of my other vacuum lines routed so I can't seem to figure out where it should end up. It's located right above the top end of the lower radiator hose and seems to follow the rear metal coolant passage and shoots down to the middle of the steering rack where I lose track of it. I've looked at a handful of vacuum diagrams and I don't see it on there either. If any of you have an idea of where it goes, please let me know. I'll try to track down the other end tomorrow and send an update if I figure it out.

 

It ended up being the yellow EVAP hose that connects to the intake pipe. Saw the other half of the elbow still attached to the vacuum line.