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Most likely a bad heater core
A bad heater blower motor resistor would effect one or more blower speeds other than high.
In the Power Distribution Box in the engine compartment ( Ford recommends disconnecting the battery before servicing anything in the PD BOX ) Fuse # 9 is a red color 50 amp maxi-fuse for the blower motor and blower motor relay
how do i change my blower motor on my 2007 malibu
you would have to see a mechanic about that problem
como remplasar blower ac heater paseo 1993 toyota
Remove the glove box. The front blower motor and the resistor can be accessed from there.
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.
how do you change heater blower resister merc a class
Look behind the glove box. under dash.
the heater blower is located under the dash on the passenger side. easy to change ,4 skrews.
Behind / below the glove compartment area inside a plastic case . You can see where the heater hoses connect to the heater core at the firewall in the engine compartment