It may be the blend door actuator. This part starting making a clicking sound in my 2003 Lincoln Navigator. It is located in the back right panel next to the rear seat. When I removed the actuator and opened it up, I found that one of the gears was partially stripped.
http://certifiedrebuilders.com/
it cools itself down, that is normal
The 2003 Lincoln Town Car factory amplifier is located in the trunk. The factory installed amplifier will be on the dividing wall between the back seat and the trunk.
you have to pull the radio. once you do that remove the plastic panel. Then you will have to unscrew the clock from the plastic panel. There is a white piece on the back which is the bulb.
Usually in the Passenger side Rear quarter panel in the back of this vehicle.
its in the panel on the left of the back seat behind the drivers side.
A Chevrolet spares dealer.
on my 1985 Lincoln town car i had to remove the dash and get back to the firewall and remove a panel on the firewall to get to it. good luck it is a pain.
#30 Instrument Panel. There is a rear underseat fuse block located below the rear (back) seat on the drivers side.
The fuse box diagram for a 1988 Lincoln Town Car is located on the back of the access panel. It documents the location and function of each fuse.
on a 2003 , The spare tire is under the floor carpet in the back ,, then open the panel