1994 Corsica 3.1 Htr air supply vac line must be leaking or detached. Cannot seem to locate origin of vacuum, to trace supply path. Would hate to invest in pertinent manual, as this car is looking for a new owner, and it only has about 71K and is close to being cherry. Can someone share a clue on this? I'm almost sure this might take me under the dash, and this 75 year oldman doesn't look forward to that crawl-around-activity. Sincerely appreciate a little help from an experienced practical contributor. Thanks to You!