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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.cougarpartscatalog.com/1919mecovaac.html
A Haynes manual available at most auto parts stores or you can check your local library.
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Which vacuum diagram The Underhood for the engine or the vacuum for the interior /AC system?
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hard to come by if it is not on sticker under hood. Try Mitchel on demand at mitchel1.com I think... they sell info by the piece not surelocal school or collage with automotive program will most likely have there full system. and will lllok it up for you. RickASE L-1 MasterTransMichigan.com
Get a vacuum diagram from MOTORLIT.COM
MAP Sensor on a 1994 Cougar is located on the firewall. Has a vacuum hose coming from it and an electrical connection.
You can get that at the library in one of the Automotive Repair Books dealing with Mercury Villagers. I think you mean Vacuum Hose Diagram anyways.
I'd suggest buying a repair manual.