Try a Haines or Chilton manual for your year and make. Your local car parts store or local library should have them
You can find the air conditioner schematic for the 2000 Mercury Cougar online at places like Parts Train. You can also find this schematic in the Chilton's repair manual for the vehicle.
how to find a vacume leak on a1999 cougar
When they get their web site fixed, you can see one at AUTOZONE.COM
http://www.cougarpartscatalog.com/1919mecovaac.html
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.
A Haynes manual available at most auto parts stores or you can check your local library.
How do i find the instructions for changing out the fan switch assembly in a 2001 Mercury Cougar?
You can find a detailed vacuum hose schematic for a 1984 Oldsmobile Cutlass Supreme in the car's owner's manual. You can also check with local auto stores.
You can find the correct firing order for your 1987 mercury cougar at www.coolcats.com, it is a website dedicated to the cougar and thunderbird.
my tire sizes for my cougar are P215/50R16 or go here so you can find your size http://www.dragtimes.com/Mercury-Cougar-Tires-m31-n237.html
You can find this schematic (and others) in the Chilton's manual for your truck.
try iboats.com