I pulled off my air pump in order to change my thermostat, and look at the ugly
sight I found (obnoxiously large pic, scroll over a bit).



Not only is there a blown coolant hose, but note the unattached vacuum line nipple. (oh, and the split blue hose is just covering some wires)

I replaced the turbo coolant line. Can anyone tell me what vacuum line that is and/or what system(s) it affects?

 

so did you rip that coolant hose taking off the airpump or what? You probably would have noticed if that hose was torn while you were driving the car no? Is that why you went to change your thermostat? Thought the car was overheating because of that?

I can't find the nipple in your pic but here is a diagram that will help you take care of it
http://plaza.ufl.edu/yanni25/vacuum_hose_diagram2.JPG

 

Which Vacuum line are you asking about?

 

Drove the car hard at the track over the weekend where it was getting
warmer than it should (240F or so), but always under control. Drove 2 1/2
hours home where it ran slightly warmer than usual (195F).

Parked it, came back out in an hour and found it had puked coolant all over the
driveway. My assumption was overflowing overflow bottle due to track heat
extremes...

Decided to replace thermostat simply as an aid to controlling track temps, but
apparently found where all the coolant came from. Odd that it doesn't look like
coolant has been splashed all over that area, though...

The vacuum-line-to-nowhere is immediately to the left of the blown hose, ending
in a right-angle nipple that should be attached to the y-pipe. You can see it is
shinier where it should be inserted.

 

OIC, Your right, that belong in the y-pipe, right below the other one sticking out. There should be a hole there.

 

In the vacuum hose diagram, it is the yellow line that goes from the y-pipe
to ... ?

 

Yes you're correct, It goes to the inside of the LIM under the injectors.

 

Are you gonna trust a guy with 666 posts?

The correct answer is it goes to the inside of the LIM under the injectors.

 

What about now?

 

Ok, but what does it do??? Could it be responsible for boost difficulties? Rough idle?

System holds 16-17 lbs vacuum at idle, regardless. Maybe I'll get 18-19 with it patched.