Here's a general outline of the steps involved. This is not a complete, step-by-step guide, and specific procedures may vary depending on your Blazer's exact model and trim level. Always consult a factory repair manual specific to your 1991 Chevy Blazer for detailed instructions and torque specifications.
1. Safety First:
* Disconnect the battery's negative terminal. This is crucial to prevent electrical shorts and accidental airbag deployment.
* Wear safety glasses and gloves.
2. Preparation:
* Gather your tools: You'll need a variety of sockets, wrenches, screwdrivers, possibly a steering wheel puller, and potentially a torque wrench.
* Obtain a factory repair manual: This is essential for detailed instructions and torque specifications. A Haynes or Chilton manual might suffice, but a GM factory manual is preferred.
* Have the new steering column ready. Ensure it's the correct one for your Blazer model.
3. Removing the Old Steering Column:
* Disconnect the steering wheel: This usually involves using a steering wheel puller. Be careful; the airbag (if equipped) must be handled correctly to avoid deployment. Consult your repair manual for proper airbag handling procedures. If you are unsure, leave this to a professional.
* Disconnect all electrical connectors and linkages: This includes the turn signal switch, ignition switch, cruise control (if equipped), and other components connected to the column. Take pictures or make notes to remember the connections.
* Disconnect the steering shaft: This usually involves separating the column shaft from the steering gear box.
* Remove the column from the vehicle: This often involves removing bolts and brackets securing the column to the firewall and floor.
4. Installing the New Steering Column:
* Install the new steering column: Reverse the removal process, ensuring all components are correctly aligned and securely fastened.
* Reconnect the steering shaft: Make sure the shaft is properly aligned and seated.
* Reconnect all electrical connectors and linkages: Double-check your connections against your notes or pictures.
* Reconnect the steering wheel: Again, be very careful with the airbag if your vehicle is equipped with one.
* Reconnect the battery's negative terminal.
5. Testing and Adjustment:
* Test all functions: Verify that the turn signals, horn, ignition, cruise control (if equipped), and other steering column controls are working correctly.
* Check the steering: Ensure the steering wheel turns smoothly and freely. Have the steering alignment checked by a professional.
Important Considerations:
* Airbag system: If your Blazer has an airbag, working on the steering column is extremely dangerous without proper training and tools. It is strongly recommended to have a qualified mechanic perform this work.
* Steering shaft alignment: Incorrect alignment can lead to binding and damage.
* Torque specifications: Using the correct torque when tightening bolts is critical to prevent damage.
This is a complex and potentially dangerous job. If you're not comfortable with these steps, take your Blazer to a qualified mechanic. Improper installation can lead to serious safety hazards. Remember to always consult your factory repair manual for detailed, model-specific instructions.
