I have an '87 Syncro an when I shut off the engine after driving I hear
a high pitched noise eminating from what I have heard to be a vacuum
'canister', (sounds like pressure escaping), that is the shape of 3
balls connected together.  (You usually see them mounted on the
underside of older rabbit or scirocco hoods.  Why is this happening?
Any ideas would be a great help!

Thanks,

Mike Garske