Tools You'll Likely Need:
* Socket set (various sizes)
* Ratchet and extensions
* Screwdrivers (Phillips and flathead)
* Pliers
* Trim removal tools (to avoid scratching plastic)
* Possibly a panel popper tool
* New blower motor (ensure it's the correct one for your model)
* Shop towels or rags
* Possibly a flashlight or work light
General Steps (These steps are generalized and may vary slightly):
1. Disconnect the Battery: This is crucial for safety to prevent accidental shorts. Disconnect the negative (-) terminal first.
2. Access the Blower Motor: This is usually located behind the glove box or under the dashboard on the passenger side. You'll likely need to:
* Remove the glove box. This often involves removing screws and possibly some clips.
* Remove any trim pieces or panels that obstruct access to the blower motor. Be gentle to avoid breaking clips. Your repair manual will provide the exact steps for your year and model.
3. Disconnect Electrical Connections: Once you have access to the blower motor, carefully disconnect the electrical connector. Take a picture beforehand to ensure you reconnect it correctly.
4. Remove the Blower Motor Housing: This usually involves removing several screws or bolts securing the housing. The housing might be tricky to maneuver out, depending on the design.
5. Remove the Blower Motor: The blower motor itself is typically held in place by screws or clips. Remove these fasteners to free the motor.
6. Install the New Blower Motor: Carefully install the new blower motor, ensuring it's securely fastened in the housing.
7. Reassemble Everything: Carefully reinstall the blower motor housing, trim pieces, and glove box, reversing the removal steps. Make sure everything is securely fastened.
8. Reconnect the Electrical Connections: Reconnect the electrical connector to the new blower motor, making sure it's secure.
9. Reconnect the Battery: Reconnect the positive (+) terminal to the battery.
10. Test the Blower Motor: Turn on your vehicle's AC/heating system and test all blower speeds to ensure the new motor is working correctly.
Important Considerations:
* Repair Manual: A repair manual specific to your 1999 GMC Suburban is highly recommended. It will provide detailed instructions, diagrams, and torque specifications, which are crucial for a successful repair.
* Patience: This is not a quick job. Take your time and be methodical to avoid damaging anything.
* Safety: Always disconnect the battery before starting any electrical work.
* Professional Help: If you're uncomfortable with any of these steps, it's always best to seek professional help from a qualified mechanic.
This is a general overview; the exact steps may vary depending on your specific vehicle's configuration. Refer to your repair manual for precise instructions and safety precautions. Remember safety first!
