1. Location: The blower motor is typically behind the glove compartment (passenger-side).
2. Preparation:
* Disconnect the battery's negative terminal. This is crucial for safety to prevent electrical shocks.
* Gather your tools: You'll likely need screwdrivers (Phillips and possibly flathead), possibly sockets, pliers, and a flashlight. A trim removal tool is highly recommended to avoid damaging plastic parts.
* Consult your repair manual: This is the most important step. It will have specific diagrams and torque specifications.
3. Accessing the Blower Motor:
* Remove the glove compartment: This usually involves removing screws holding it in place. There may be clips or fasteners as well. Carefully pry it loose, noting how everything is connected.
* Remove any obstructing parts: You may need to remove other components in the area to gain better access, such as parts of the dashboard trim or other HVAC components. The repair manual is essential for this step.
* Locate the blower motor housing: This is usually a metal or plastic housing surrounding the motor itself. You may need to remove some additional screws or fasteners to access it fully.
4. Removing the Blower Motor:
* Disconnect the electrical connector: Carefully unplug the electrical connector from the blower motor.
* Disconnect the blower motor's ductwork: There will be hoses or ducts connected to the blower motor housing. Disconnect these carefully, making note of their placement for reassembly.
* Remove the blower motor: This might involve unscrewing the motor from its housing or possibly unclipping it. Again, the repair manual will show you precisely how to do this.
5. Installing the New Blower Motor:
* Install the new blower motor: Reverse the removal steps. Ensure the blower motor is correctly seated and securely fastened.
* Reconnect the ductwork: Make sure everything is firmly connected and properly sealed.
* Reconnect the electrical connector: Securely plug the electrical connector back into the blower motor.
* Reassemble the glove compartment and other removed parts: Put everything back in place, making sure it is all properly secured and clips/screws are tightened.
6. Testing:
* Reconnect the battery's negative terminal.
* Turn on the ignition and test the blower motor: Select different fan speeds to confirm that the new motor is working correctly.
Important Considerations:
* Take pictures: Before removing anything, take pictures of the assembly to aid in reassembly.
* Label wires: If you disconnect any electrical connections, label them clearly to avoid confusion during reassembly.
* Patience: This is a time-consuming job, so be patient and methodical.
This is a general guide. You absolutely should obtain a repair manual specific to your 1991 Chevy S-10 before attempting this repair. Improper installation could damage other components or lead to further problems. If you're uncomfortable working on your vehicle yourself, it's best to take it to a qualified mechanic.
