You should be able to get it from your local library... Most Libraries have a pretty good reference section with professional service manuals, be prepared to have copies made since you are unable to "check out" these books to take home... And if your public library does not have them, well, then your local Chevrolet dealer service department should be able to print a copy from one of their Tech web sites they are members of... You can gain access to these sites too, but they are kinda expensive to become a member of for a year just for 1 piece of info.... Hope this helps...
It is important to have a diagram when making changes to a car. The vacuum line diagram for a 1994 Ford F-150 can be found in the maintenance manual to the vehicle.
You can get a vacuum diagram for a 1994 Mercury Cougar 4.6 liter in the Chilton's manual for that year and model. You can also find the diagram online at All Data DIY and at Engine Guy online.
http://www.kick-fix.com/find-parts.html on the hood is a vacuum diagram. required by law. open hood. look up .under hood ,not down.
under the hood or inside the door jam
The vacuum diagrams are too large for me to post here. But you can get them at the Public Library in the Reference Section.
Visit tha www.autozone.com and choose make, year, engine
On mine it is on a label on the upper radiator rail.
The basic engine vacuum diagram should be located on the underside of the hood on an emission controls sticker. For a more detailed diagram, you may have to consult a repair manual at your local library or seek help from a dealer.
chilton manuals have a lot of details
You can find a free Ford F1 50 vacuum diagram at most Ford dealerships. Many auto-parts stores will have the vacuum diagram.
Which vacuum diagram The Underhood for the engine or the vacuum for the interior /AC system?
You can find a vacuum diagram for your 1992 Chevy Lumina at most Chevrolet dealerships. Chevrolet service manuals will have the vacuum diagram and can be found at most local libraries.