You have to pull the dashboard out to get to it. If you are mechanically inclined, then I suggest you obtain a factory service manual for your specific car(they can be found on eBay pretty cheap sometimes) and also go to TCCoA.com -that's Thunderbird & Cougar Club of America and do some research in the forums & tech articles. Also whether you or someone else does the job, do yourself a favor and put a ground wire/strap on the new one to make it last longer. This helps null the electrolytic reaction between the anti-freeze and the heater core which eats at the metal and causes premature failure. It's a all day job & you will need help to lift the dash and move it into the front seats, also do a thorough cleaning job on the blower box it's mounted in to remove all the anti-freeze or you will have a smell for quite a while after replacement.
If the lightbulb itself is burnt out on a 1991 Mercury Cougar then just replace the light. If it is the wiring that is the problem then find the burnt wires and cut them. Replace them with new wiring.
The 3.8 liter V6 engine in a 1991 Mercury Cougar has a timing CHAIN
1991 mercury cougar i need to know the egnition timing engine is a 3.8 v6.
On a 1991 Mercury Cougar : The oil pump is INSIDE the oil pan ( the oil pan is bolted to the bottom of the engine )
According to my Chilton's Auto Repair Manual : ( A 1991 Mercury Cougar has a 19.0 U.S. gallon gas tank )
My 1991 Mercury Cougar LS 3.8 4 Speed Automatic weighs in around 3800lbs.
I can't say for sure , but the ( 1996 ) Mercury Cougar is ( 18.0 US. gallons ) * also the 1991 Mercury Cougar is 19.0 US. gallons
According to my Chilton"s Auto Repair Manual : For a 1991 Mercury Cougar ( 19.0 US. gallons )
According to my Chilton's Auto Repair Manual : For a 1991 Mercury Cougar : ( 19.0 U.S. gallons )
Under the dash on the drivers side of the car.
with a socket & wrench