1. Preparation:
* Safety First: Disconnect the negative battery terminal to prevent electrical shorts.
* Gather Tools: You'll need various tools, including:
* Screwdrivers (Phillips and possibly flathead)
* Panel removal tools (to avoid scratching the interior)
* Window regulator removal tool (often specialized)
* Possibly a ratchet and sockets
* Putty knife or similar for sealant removal
* New window regulator (if needed) – often the regulator, not just the glass, fails
* New window felt/weatherstrip (highly recommended)
* Window installation tool (highly recommended to avoid scratching the glass)
* Clean rags and shop towels
* Sealant (appropriate type for automotive glass)
* Obtain a Repair Manual: A Haynes or Chilton manual for your year and model Firebird will be invaluable. It will show you exactly how your specific model is assembled and what parts you might need.
2. Door Panel Removal:
* Carefully remove the interior door panel. This typically involves removing screws and possibly clips. Your repair manual will detail the exact procedure. Take your time and be gentle to avoid breaking clips.
3. Regulator and Window Removal:
* Once the panel is off, you'll see the window regulator mechanism. This is the system that raises and lowers the window.
* Disconnect the motor connector from the regulator.
* If the regulator is damaged, you'll need to remove it. This often involves removing screws and possibly bolts. The regulator may be attached to the door with rivets. You might need a rivet removal tool or drill to remove these.
* Carefully remove the old window glass. It's usually held in place by the regulator. If the glass is cracked, handle with extreme care to avoid further breakage. A window glass removal tool can be very helpful.
4. Regulator Installation (if needed):
* Install the new window regulator, if necessary, reversing the removal steps. Ensure it's properly seated and all fasteners are secure.
5. Window Installation:
* Carefully install the new window glass into the regulator. Use a window installation tool to avoid scratching the glass. Ensure it slides smoothly in the regulator channels.
6. Reassembly:
* Reconnect the window motor connector.
* Carefully reinstall the interior door panel. Make sure all clips are properly engaged.
* Test the window operation.
7. Sealant and Weatherstrip:
* If you replaced the regulator or the window, apply new automotive sealant around the window's edge where it meets the door. This prevents water leaks.
* Install new window felt or weatherstrip. This is crucial for a proper seal and to prevent drafts and leaks.
Important Considerations:
* Window Regulator: The window regulator is a common failure point. It's often more cost-effective to replace the entire regulator assembly rather than attempting to repair a broken one.
* Glass: The glass itself is relatively fragile. Handle with extreme care to avoid breakage.
* Professional Help: If you are not comfortable with this type of repair, it's best to take your Firebird to a qualified mechanic or auto glass specialist. Improper installation can lead to significant problems.
This is a simplified overview. Again, refer to a repair manual specific to your 1998 Pontiac Firebird for detailed, step-by-step instructions and diagrams. This will save you time, frustration, and potential damage.
