A bad heater blower motor resistor would effect one or more blower speeds other than high.
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.
Look behind the glove box. under dash.
maybe your blower motor relay is stuck or burned together ???
If your blower is working on some speeds but not all, more than likely the problem is a defective Blower Motor Resistor Pack. The switch rarely goes bad. Just a thought.
Heater blower fans or engine cooling fans????? See "Related Questions" below for both.
Your ac/heater blower motor may be going out, located below the glove box compartment.See "Related Questions" below for more about this easy do-it-yourself repair.
change the blower motor the bearings have gone bad in it
Right side
No pictures here, but see sources listed in the "Manual" question below. For detailed instructions, see the "Related Question" below for that too...
Without knowing what model year the questioner is referring to...Budget somewhere around $35-60 for a blower motor - likely to be closer to the lower endSee "Related Questions" below for more
NO!This is a great do-it-yourself repair!Other than some cars having a bit of trim piece over the passenger side, blower motors are just 3, maybe 4 small screws and 1 electrical connector.Sidebar: the blower resistor that provides the ability to have more than one blower speed, is just to the left of the blower. An even easier repair, and not uncommon to fail (blows on high speed only).See "Related Questions" below for more