First make sure that the wire to it isn't corroded off, known problem with the Marks.
You can replace it with '94, 95 and some 96.
yes you can use a 94 or 95 i have a 95 control for sale
A/C or Heater? Be more specific.
Passenger side up under the glove compartment.
Passenger side under the dash behind the glove compartment.
You have to replace it.
Under the dash passenger side
Go to http://www.lincolnvscadillac.com/tech/lincoln-mark-viii/Coil-Spring-Conversion/index.htm
This link has detailed instructions and photos http:/www.lincolnvscadillac.com/tech/lincoln-mark-viii/Thermostat-Replacement/index.htm
Passenger side behind the glove box.
hi man i am awsome
In a 1998 Lincoln Mark VIII : In the Power Distribution Box ( which is " live " ) located in the engine compartment ( # 29 is a 40 amp maxi fuse for the Blower Motor Relay )