1. If the mirror housing is mostly intact but just cracked:
* Look for access points: Carefully examine the remaining housing for small access panels, slots, or seams. Sometimes there are small holes or gaps you can use a small screwdriver or pick to pry open and reveal the bolt heads.
* Interior access (if possible): On some models, you might be able to reach the bolts from the inside of the car door after removing the door panel. This requires removing the interior door panel, which involves removing screws and carefully disconnecting wiring harnesses and other components. (This is best attempted with a repair manual or online guides specific to your vehicle year and model)
2. If the mirror housing is significantly broken or missing:
* Visual inspection: Carefully inspect the remaining parts. Sometimes, even with a severely broken mirror, fragments of the housing will reveal the bolt locations.
* Careful probing: Use a small, thin tool (like a long, thin screwdriver or a dental pick) to carefully probe around the area where the mirror was attached. You might feel the bolt heads or the edges of the bolt holes.
* Removal of the door panel (highly likely): This is the most likely scenario if the housing is severely damaged. You'll need to remove the interior door panel to gain better access to the mounting area. There might be residual pieces of the broken mirror obstructing the bolts. Use pliers or other tools to carefully remove any obstructions.
* Potential need for drilling: In worst case scenarios, if the bolts are completely inaccessible and rusted/stripped, you may need to carefully drill out the broken bolt heads. This requires precision to avoid damaging the door or surrounding components. This is a last resort.
Important Considerations:
* Repair Manual: A repair manual specific to your 1996 Pontiac Grand Prix is invaluable. It will provide diagrams showing the exact location of the bolts and the process for removing the door panel.
* Patience and caution: This is a delicate process. Take your time and avoid using excessive force, which could cause further damage.
* Safety: Wear safety glasses to protect your eyes from flying debris.
* Replacement Mirror: Before you start, consider whether replacing the entire mirror assembly might be easier and less risky than trying to salvage the broken one. Replacement mirrors are readily available online and at auto parts stores.
If you're uncomfortable tackling this repair yourself, consider taking it to a professional mechanic. They have the experience and tools to remove the broken mirror efficiently and safely.