If this question is referring to the blower motor resistor - fan operates only on HIGH speed - that's very well covered in the "Related Question" below. Hint: cheap and easy repair!
If it's a different resistor, the question will have to be edited to include a bit more identifying information as to which resistor.
Around $400 for a new install.
The 2003 Ford Taurus has a V6 engine.
The 2003 Ford Taurus has 12 valves.
The 2003 Ford Taurus has a 4-speed automatic.
The 2003 Ford Taurus is a gas-powered vehicle.
The 2003 Ford Taurus has overhead valves (OHV).
The curb weight of the 2003 Ford Taurus is 3355 lbs..
The height of the 2003 Ford Taurus is 4 ft. 8.1 in. (56.1 in.).
The 2003 Ford Taurus is 16 ft. 5.6 in. (197.6 in.) long.
The 2003 Ford Taurus's turning circle is 39.7 ft..
The 2003 Ford Taurus runs on regular unleaded.
The 2003 Ford Taurus has 57.3 in. of front shoulder room.