The wording of this description leaves the possibility the blower only works on the highest setting, and other possibilities.
The "Related Questions" below are a comprehensive trouble-shooting guide to diagnosing the causes of heating problems in Taurus/Sables.
Should be a good start to finding a fix to this one too...
A leaky heater core can do that. Also if the AC is not operative, the defrost mode can't dry the cabin air.
you need to replace your heater core
Why engine stalls on 1993 Chrysler Intrepid while driving and sometimes at stops?
sometimes, but not while driving
Low coolant, failed thermostat, partially plugged heater core...............
The cause for a 1991 Ford Taurus to just cut off while driving is probably a problem with the computer. If the car will start again after about 90 minutes, then check the computer module for code errors.
Look for a leak in the heater/defrost system. Most times it is caused by a minor water leak in the heater system. Steve
You have a bad blower resister..............
sometimes
you need to replace the cam shaft positioning sensor
Only blows cold air with the a/c on while driving, your cooling fan or fan clutch is bad depending on the year, make and model.......... Only blows cold air with the heater on while driving, you will have a bad or broken internal a/c - heater control door.....
WHAT IS THE FUSE USED FOR, RADIO,HEATER,TAIL LIGHTS, ETC FIND OUT WHAT IT CONTROLS AND CHECK THE WIRES, IF YOU HAVE A MULTIMETER IT WILL BE EASIER PAUL G