It depends on what is wrong with it. First make sure there is vacuum going into the cab from the engine compartment.
If the problem is switching between Defrost and Vent, the problem is most likely a vacuum issue since this function is vacuum controlled. If the issue is lack of heat, most likely the problem is with the heater core or blend door. Check HeaterTreater.net for pictures and diagnostic information...and a blend door fix.
See "Related Questions" below for more about Taurus - Sable heating systems.
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