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Probably your blower motor speed resister is burned out.
There is a resistor near the blower that is bad, known cause is high speed only.
The blower motor resistor pack is bad.
Blower speed resister is burned out.
The blower motor speed resistor is burned out.
The blower motor fuse protects the blower motor electrical circuit. The blower motor relay operates only the high speed function of the blower motor. The blower motor speed resistor operates the lower speed functions of the blower motor.
Blower motor speed resistor is partially burned out.
If you look in the manual you will find that position 1-3 and position 4 BOTH have a fuse. Try replacing the fuse for position 4...
either the blower control switch or the blower motoer needs replacing
Bad blower resistor?
The most likely problem with the heater blower on your 2003 Sable is the blower resister. The resister can go bad and cause you to only have one speed.
If the one speed it works on is high speed, it is the blower motor speed resisitor that is bad.