crushingday

I found this blue hose unconnected. It is located under the plastic cover on the drivers side between the fire wall and the windshield. it disapears through the wall into the guage cluster area.
I am assuming it is climate control related, but am not certain.

Ducman82

blue "should" be the recalculation flap.
http://928classics.com/uploads/3/3/4...ac-version.pdf

Bill Ball

Looks like somebody rerouted/replaced some of the vac lines. Where do the orange ones appear to go? You should get into the climate control vacuum blocks using the information in the link Ducman82 provided.

Hold On

Hook it to a vacuum source (like a Mityvac) and see what changes or if it even holds a vacuum.