If you are asking for a 1996 or newer model year, it is located just below the dash on the driver's side above the OBDII port. It is not hard to access. Drop the lower dash panel for light access and uncouple the harness clips. Slip it back and replace with the new one.
Take it to the mechanic.
How do you replace the timing chain on a 1994 mercury grand marquis
how do i replace a passenger side headlamp for a 2004 grand marquis gs
There isn't one. The 1995 Grand Marquis uses a lighting control prossessor. They are very expensive to replace. The part cost me $325.00.
how do you replace the front sway bar likn in a 1999 Grand Marquis?
how to replace starter on 2000 mercury grand marquis
In the center of the dash. It's the unit you select options on. It controls the AC and Heat.
how do you get to and replace the wiper moter on a 97 marquis
Fuse is blown.
The panel is broken. Replace it
take it to a shop
alot
A 2000 Grand Marquis does not have struts, it uses a conventional shock/spring type suspension.