Tools You'll Need:
* New blower motor resistor: Make sure you get the correct part number for your specific Trailblazer.
* Screwdrivers: Phillips head and possibly flathead, depending on your vehicle.
* Socket set (optional): Might be needed depending on the access to the resistor.
* Needle-nose pliers (optional): Can help with manipulating connectors.
* Penlight or flashlight: To see in tight spaces.
Steps:
1. Disconnect the Battery: This is crucial to prevent electrical shorts and injury. Disconnect the negative (-) terminal first.
2. Locate the Blower Motor Resistor: This is usually located behind the glove box (passenger-side compartment). Some models may have it under the dash, requiring more extensive disassembly.
3. Remove the Glove Box (if applicable):
* Open the glove box fully.
* There are usually screws or clips holding the glove box in place. Carefully remove these.
* Gently lower the glove box to gain access to the area behind it.
4. Locate and Access the Resistor: Once the glove box is out of the way (if needed), you should see the blower motor resistor. It's often a small, rectangular black plastic unit with several wires connected to it. You might need to remove some screws or clips holding it in place.
5. Disconnect the Electrical Connectors: Carefully unplug the electrical connectors attached to the resistor. Some connectors might have locking tabs; gently press these tabs to release the connectors. Take a picture before disconnecting to aid reassembly.
6. Remove the Old Resistor: Remove any screws or fasteners holding the old resistor in its housing. Remove the resistor carefully.
7. Install the New Resistor: Carefully align the new resistor in its housing. Secure it with the screws or fasteners you removed earlier.
8. Reconnect the Electrical Connectors: Carefully plug the electrical connectors back into the new resistor, ensuring a secure connection. Refer to the picture you took earlier if needed.
9. Reinstall the Glove Box (if applicable): Carefully reinstall the glove box, making sure everything is securely fastened.
10. Reconnect the Battery: Reconnect the negative (-) terminal, then the positive (+) terminal.
11. Test the Blower Motor: Turn on your vehicle's ignition and test all blower motor speeds. If all speeds work correctly, the replacement was successful.
Important Considerations:
* Variability: The exact location and access to the resistor can differ slightly between Trailblazer models. Refer to a repair manual specific to your year and model.
* Safety First: Always disconnect the battery before starting any electrical work.
* Patience: This is a relatively straightforward repair, but it can be fiddly, especially accessing the resistor. Take your time and be careful not to damage any wires or components.
* Professional Help: If you're not comfortable performing this repair yourself, consult a qualified mechanic.
This guide provides a general overview. Always refer to a repair manual specific to your 2002 Chevy Trailblazer for detailed instructions and diagrams. Using a repair manual significantly increases your chances of success and minimizes the risk of damage to your vehicle.
