Plug in your seatbelt.
The 3.8 liter V6 engine in a 1991 Mercury Cougar has a timing CHAIN
The 4 cylinder has a timing belt
The seat belt motor is located on the lower panel behind the front seats. Get in the back seat sitting it will be just above ankle height.
It must have a timing chain because Gates ( they make timing belts etc. ) only lists a timing belt for the 4 cylinder engine on a 2000 Mercury Cougar
Dual chains
timing CHAIN
The Haynes Repair Manuals would have a diagram of the serpentine belt on a 94 Mercury Cougar XR7. You can find the manual at your local library, book store, or most auto parts stores.
The 2.0 litre four cylinder engine in a 2000 Mercury Cougar has a timing BELT
In the belt book at most autoparts stores have a diagram section for serpentine belt routing.
The 2.5 litre V6 engine in a 1999 Mercury Cougar has ( 1 timing CHAIN to each cylinder head , so there are 2 timing CHAINS )
Chain and it is a very (~1000.00) costly fix.
You have to release your tensioners in order to release your serpentine belt. When you put the belt back on you have to follow the diagram on the hood of your car.