Tools You'll Need:
* Socket wrench set (likely a 7mm, 10mm, and possibly others)
* Phillips head screwdriver
* Flathead screwdriver (possibly)
* Needle-nose pliers (helpful)
* New blower motor resistor (ensure you get the correct one for your vehicle)
* Shop rag or paper towels
Steps:
1. Disconnect the Battery: This is crucial for safety. Disconnect the negative (-) battery terminal first.
2. Access the Blower Motor Resistor: The location varies slightly. It's typically located behind the glove compartment (passenger-side).
* Glove Compartment Removal: Most likely, you'll need to remove the glove compartment. This usually involves:
* Opening the glove compartment fully.
* Looking for screws or clips holding it in place (usually along the sides and top). These might be hidden behind small access panels.
* Carefully remove the screws or unclip the clips.
* Gently lower the glove compartment. It might be hinged at the top, allowing it to swing down.
3. Locate the Blower Motor Resistor: Once the glove compartment is out of the way, you should see the blower motor resistor. It's a small, usually rectangular or square, black plastic unit with several wires connected to it. It might be mounted on a metal bracket or directly to the HVAC housing. Take a picture before you disconnect anything, this will help with reassembly.
4. Disconnect the Electrical Connectors: Carefully unplug the electrical connectors from the blower motor resistor. You may need a small flathead screwdriver to gently pry them apart. Note the position of each connector for reassembly.
5. Remove the Blower Motor Resistor: Depending on how it's mounted, you might need to remove a few screws or clips holding it in place. Sometimes it just pulls out after the connectors are disconnected.
6. Install the New Blower Motor Resistor: Install the new blower motor resistor in the reverse order of removal. Make sure the connectors are securely plugged in.
7. Reassemble: Carefully put everything back together, ensuring the glove compartment is securely fastened.
8. Reconnect the Battery: Reconnect the negative (-) battery terminal.
9. Test the Blower Motor: Turn on your ignition and test all blower motor speeds. If it works correctly, you've successfully replaced the resistor.
Important Considerations:
* Consult a Repair Manual: A repair manual specific to your 2003 Chevy Trailblazer is highly recommended. It will provide detailed diagrams and instructions specific to your vehicle's model.
* Variants: The exact location and access method might be slightly different depending on the specific model year and trim level of your Trailblazer.
* Safety: Always disconnect the battery before working on any electrical components in your vehicle.
* Parts: Make sure you purchase the correct blower motor resistor for your Trailblazer. The part number can be found in your owner's manual or online using your vehicle's VIN.
If you are uncomfortable performing this repair yourself, it's best to take your vehicle to a qualified mechanic. Improper repair could damage other components.
