depending on the year there are several ways to do this, also depending on whether your putting one in or using a stock one on a newer year car, there is also the premium sound system that can be a severe pain to work on, try asking a more specific question including the year and it may help you get a better answer
According to the 1999 Mercury Cougar Owner Guide the six disc CD changer ( if equipped ) is located in the luggage compartment
2002
yes
most stock CD players or radios have about 200 watts in them unless you upgraded the stero when u got the car
The 2001 Mercury Sable does come with a CD player. If the car does not have a CD player in it, an install kit can be purchased to install a CD player.
The CD player was an option at the time of purchase - which means that many 1997 Mercury Sables do not have CD players.
The CD changer is in the center console of a 2000 Mercury Villager
Yes your data CDs will work on your CD player, but they might not work with your car stereo, due to different formats.
You should try to clean the CD player out the lazer is probably built up with dust
inside the arm rest
I believe this means that a disc may be jamming inside the player. I had this happen under warranty and was replaced by my dealer. I will verify in my Mercury Shop manual. Either case, take it to your dealer. You will probably need a new unit.
Yes, you can put a CD player in a 1998 Mercury Sable. Simply take the vehicle into an automotive audio shop. They will install a single or 6 disc changed CD player while you wait. They can also modify your antennae and other audio and speaker settings.