1. Locate the Blower Motor Resistor:
* Most common location: Under the dashboard, usually on the passenger side, near the blower motor itself. It's often a small, rectangular or square-shaped unit, possibly with several wires attached. You might need a flashlight and potentially some patience to find it. Some people find it easier to access by removing the glove box.
* Less common location: Some Blazers might have it located behind the glove box or even in the HVAC unit itself, requiring more extensive disassembly. A shop manual specific to your year and model would be helpful in this case.
2. Gather Tools:
* Screwdrivers: Phillips and/or flathead, depending on the resistor mounting screws.
* Socket wrench set (optional): Some resistors might have nuts instead of screws.
* Needle-nose pliers or a small wire stripper/crimper (optional): To help with wire connections if necessary.
* New Blower Motor Resistor: Make sure you get the correct replacement part for your 1992 Chevy Blazer. The part number should be clearly identified in your owner's manual or through an online parts catalog using your VIN.
3. Access the Resistor:
* If under the dashboard: You may need to remove the glove box (usually involves removing a few screws or clips). This will give you better access to the area behind the glovebox where the resistor is likely located. Some models might require partial dashboard removal for better access, but this is less common.
* Other locations: Refer to a repair manual specific to your Blazer's year and model. This will provide detailed instructions and diagrams to guide you through the process.
4. Disconnect the Wires:
Carefully disconnect the electrical connectors from the old blower motor resistor. It's a good idea to take pictures before disconnecting anything, so you know how to reconnect the wires correctly. Note the color and position of each wire.
5. Remove the Old Resistor:
Unscrew or unclip the old resistor from its mounting location. Again, take pictures as you go, in case you have trouble remembering the assembly procedure.
6. Install the New Resistor:
Mount the new resistor in the same location as the old one. Securely attach it using the screws or clips.
7. Reconnect the Wires:
Reconnect the electrical connectors to the new resistor, matching the wire colors and positions to the pictures you took earlier. Make sure the connections are secure.
8. Reassemble:
Carefully put everything back together, reinstalling the glove box (if you removed it) and any other panels you might have taken off.
9. Test:
Turn on your ignition and test your blower motor on all speeds. If the blower motor works correctly on all speeds, you've successfully replaced the resistor.
Important Considerations:
* Safety First: Disconnect the negative battery terminal before starting any work to prevent electrical shock.
* Repair Manual: A repair manual specific to your 1992 Chevy Blazer is highly recommended. It will contain detailed diagrams and instructions, making the process much easier and less prone to errors.
* Professional Help: If you're not comfortable working on your vehicle's electrical system, it's always best to take it to a qualified mechanic.
This guide provides general steps; the specifics might differ based on your Blazer's configuration. Always consult a repair manual for your specific model year to ensure accurate and safe completion of the repair.
