How do i change the Blower motor resistor on a 2005 chevy impala?

The blower motor relay is energized when the Blower Motor Control is set to the High position. This removes the blower motor resistors from the circuit and battery voltage is then applied directly from the HVAC BLO fuse (RH IP Accessory Wiring Junction Block) to the blower motor though the relay switch contacts. The blower motor then runs at high speed.

HVAC Blower Controls Circuit Description
The blower motor is a variable speed motor. The motor operates at a higher rate when voltage is increased to the maximum level.
The blower motor resistors reduce the voltage supplied from the A/C FAN fuse (LH IP Accessory Wiring Junction Block) when the blower control is set at low and medium speeds (speeds 1-4). The blower motor relay is energized when the Blower Motor Control is set to the High position. This removes the blower motor resistors from the circuit and battery voltage is then applied directly from the HVAC BLO fuse (RH IP Accessory Wiring Junction Block) to the blower motor though the relay switch contacts. The blower motor then runs at high speed.

There are two fuses, relay, and a resistor module.

See diagram at following link.

http://a.2002-acura-tl-radio.info/page-b/2012-chevy-1500-blower-motor-wiring-diagram-31807.html

The blower motor resistor is located under the dash on the passengers side between the blower motor and the fire wall. You will need to remove the hush panel first, also if you remove the blower motor the resistor will be easier to replace.

Your impala doesn't have a resistor , it has a blower motor control processor and it doesn't work the way you think it does
Chevy Trailblazer EXT Blower Motor Won Turn Off
Blower Motor Control Processor
The blower motor control processor is an interface between the HVAC control module and the blower motor. The blower motor speed control, battery positive voltage and ground circuits enable the control processor to operate. The HVAC control module provides a PWM signal to the control processor in order to command the blower motor speed. The processor supplies 12 volts to the blower motor through the blower motor voltage supply circuit. The control processor uses the blower motor ground as a low side control to adjust the blower motor speed.

HVAC Blower Motor Circuit

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this above is the resister block. next is the location-

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It sounds like the blower resistor needs to be replaced and the blower motor it self. Auto Zone will have the blower and resistor that you need to replace and will have the step by step instructions for you to get the job done with common tools and will take about 2 hours if your good with tools. Good luck and keep me posted. Setting 5 should have 12 volts running to the blower motor so check the wire harness for voltage readings at the blower motor harness clip, you may only just need a new blower motor.

If it's only working on high setting it is usually the blower resistor that needs replacing. They are usually located under dash, passenger side, remove cover, and it should be bolted or screwed near blower motor itself. $10-$20 part

First I would check to make sure there is/is not 12v going into the blower motor.  You can test this with a volt meter by unpluging the two wire plug that plugs into the blower motor.  This is located under the passengers side glove box. IF YOU DO NOT HAVE 12V TO THE BLOWER MOTOR (WHILE THE BLOWER IS TURNED ON WITH THE KEY ON) PROCEED TO THE NEXT PARAGRAPH.  If you do have 12v, then it more than likely is your blower motor.
If this isn't the problem then I would check the Blower Motor Resistor.  This part controls the speed in which the motor actually turns. (the knob in the dash doesn't actually resist the 12v from the battery causing the fan to move at the different speeds, the blower motor resistor does)  This part is easily changed.  It usually takes about 20-30 mins at the most.  It is located in the air ducting under the passenger's side of the dash.  The part is pictured here...

Now.  I have done this work on a 2005 Chevy 1500 and the resistor that all parts stores has is WRONG!!! The listing is wrong! (I work for O'Reilly Auto Parts and I fought with this for about a week trying to find the right one...)  If your resistor has 3 mounting screws (as shown above) you will need a resistor off of a 2000 Chevy Impala (part number RU867   -   It is manufactured by Borg-Warner with a life time warranty.)  If you look it up for your truck (i.e. - 2000 Chevy 1500) it will show a part number RU1064.  This resistor will have only 2 mounting screws.  I don't know why these parts are listed wrong, but they are.
To change this part, just remove the screws, and unplug both electrical plugs.  Thats it.  Then just replace it with the old one.
Any further questions, just ask!!! Please rate!!! Thanks!!!

As new as your vehicle is I doubt the motor is bad. I would suggest that you change the blower motor resistor first.They are relatively inexpensive and usually the problem on newer cars.

the blower motor resistor is damaged probably in the process of removing the heater core replace the blower motor resistor, and please dont forget to rate me!!