Here's a general guide. Specific steps might vary slightly depending on the exact mirror assembly you have. Refer to a repair manual specific to your 1998 Chevy Blazer for the most accurate instructions.
Tools You'll Need:
* Screwdrivers: Phillips head and possibly flathead, depending on your mirror's mounting.
* Panel removal tools: Plastic pry tools to avoid scratching the door panel.
* Wire cutters/strippers: If you need to cut and splice wires.
* Electrical tape: To secure wire connections.
* New mirror assembly: Make sure you get the correct replacement for your Blazer.
* Socket set (possibly): Some mirrors might use nuts and bolts for attachment.
* Work light: To improve visibility.
Steps:
1. Disconnect the negative battery terminal: This prevents accidental shorts and damage to your vehicle's electrical system.
2. Remove the door panel: This is usually done by removing screws around the edges of the panel and carefully prying it away from the door using plastic panel removal tools. There are often clips holding the panel in place, so be gentle to avoid breaking them. Consult a repair manual for the specific locations of screws and clips for your Blazer model.
3. Locate the mirror connector: Once the door panel is removed, you'll find the electrical connector plugged into the back of the mirror. Carefully unplug this connector.
4. Remove the mirror: There are typically screws or bolts holding the mirror housing to the door. Unscrew these to detach the mirror. It might be necessary to slightly maneuver the mirror to access all the fasteners.
5. Compare the old and new mirror: Before disconnecting anything, carefully compare the old mirror's wiring harness and mounting points to the new one. Note the location of each wire and any special markings. This will help you connect the new mirror correctly.
6. Install the new mirror: Mount the new mirror assembly to the door using the screws or bolts you removed earlier. Make sure it's securely fastened.
7. Connect the electrical connector: Carefully plug the connector from the new mirror into the existing wiring harness. Ensure a secure connection.
8. Reinstall the door panel: Carefully put the door panel back in place, aligning the clips and screws.
9. Reconnect the negative battery terminal: Once everything is reassembled, connect the negative battery terminal back to the battery.
10. Test the mirror: Turn on the ignition and test the power, heating, and adjustment features of your new mirror.
Important Considerations:
* Wiring: If the wiring harness is damaged or doesn't match, you may need to splice wires and carefully connect them. Use color-coded wire diagrams to ensure correct connections. If you're uncomfortable with electrical work, it's best to seek professional help.
* Repair Manual: A repair manual specific to your 1998 Chevy Blazer is highly recommended. It will provide detailed diagrams and instructions for removing the door panel and accessing the mirror assembly.
* Professional Help: If you're not comfortable performing this repair yourself, take your Blazer to a qualified mechanic. Improper installation could lead to electrical problems or damage to your vehicle.
This is a general guide, and the specifics might vary depending on your Blazer's trim level and options. Always consult a repair manual for your vehicle's year and model to ensure you have the most accurate instructions. Remember safety first!
