Completely separated systems: the cool comes from an evaporator powered by the compressor, the heat from a radiator from the cooling fluid heated by the engine. If you don't have heat then either the radiator / heater or the controlling valve are clogged or respectively blocked shut. Try to clean them by running a radiator cleaning solution. If that fails the dash will have to be removed to access the heater to remove it and valve for a thorough cleaning and/or replacement.
what about the blend door?
yes, it could cause that, but it's very rare occurrence in your model
Sorry Azreal but it is a very common problem in 1997 and 98 Lincoln Mark Viii's, the controler is made of cheap plastic that rarely last very long
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It will cost you around $600 to $900 to have a mechanic change a blend door (6-8 hours job)!
What I did was lower the glove compartment and reach in on the left side of the glove compartment and you should feel a level, move the level towards you and you now have heat! NO COST!!!
Stay warm my friend!!!!
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