The Tensioner is spring loaded-use a long wrench on the center of the pulley 2 release tension-DON"T UNBOLT anything-IF it doesn't feel springy then find the bolt in the center of a (the) pulley that is.
Sometimes it has to be removed, sometimes you can loosen it on one side to be able to slip the belt past to remove and replace it.
replace keypad Mercury Marquis?
How do you replace the orifice tube on a 2000 Mercury Marquis
1993 mercury marquis
How do you replace the timing chain on a 1994 mercury grand marquis
how to replace starter on 2000 mercury grand marquis
how do you get to and replace the wiper moter on a 97 marquis
It is about 1/2 way between the engine and tank under the car. It is a simple matter of removing it and replacing it.
how do you replace the front sway bar likn in a 1999 Grand Marquis?
You have to replace the entire assembly.
take it to the dealer
You have to replace a whole thing, not only a cable