How do I replace a radio.In my 2003 lincoln town car signature se

First of all you have to remove the Instrument cluster finish panel.

Position the shifter lever in the 1st gear position.

NOTE: Ignition switch must be in OFF position if disconnecting the passenger airbag deactivation (PAD) indicator electrical connector. Otherwise, a diagnostic trouble code (DTC) will be set in the restraints control module (RCM) memory and must be erased before releasing the vehicle.

Position the ignition switch in the OFF position.

Position the steering column to the full down position.

Remove the 2 instrument cluster finish panel screws over the speedometer.
Release the retainers by pulling the bezel out working your way around it then disconnect the electrical connectors and position the instrument cluster finish panel aside.

Then remove the 2 screws in the clock and remove it.

Then remove the 4 screws in the audio unit and remove it.

There are special tools required you can get them at a auto parts place