1. Identify the Source:
* Thorough Inspection: After a rain or wash, carefully examine the trunk area, both inside and out. Look for:
* Visible cracks: In the trunk lid, taillights, or surrounding body panels.
* Loose seals: Around the trunk lid, taillights, and any other areas where the trunk meets the body.
* Holes or rust: Especially around the seams and where the body panels join.
* Clogged drain holes: Many trunks have drain holes to prevent water from accumulating. Check these for debris.
* Damaged weatherstripping: This is a common culprit. Check for cracks, tears, or areas where it's pulling away from the body.
* Broken or missing parts: Look for any damaged clips or fasteners.
* Interior leaks: Sometimes water enters through a sunroof or window and flows down into the trunk.
* Water Test (if safe): If you can't easily identify the source, you can carefully use a hose to simulate rainfall on the suspect areas. Have someone inside the trunk to pinpoint where the water is entering. Be cautious not to short-circuit any electrical components.
2. Repairing the Leak:
Once you've found the source, you can begin repairs:
* Cracks/Holes: Small cracks can often be repaired with automotive sealant or epoxy. Larger holes may require more extensive repair, possibly involving welding or body filler (depending on your skills and the extent of the damage).
* Loose Seals: Re-seal any loose areas with automotive-grade sealant or weatherstripping adhesive. If the weatherstripping itself is damaged, replace it. You can purchase replacement weatherstripping at most auto parts stores.
* Clogged Drain Holes: Clear the drain holes with compressed air or a small wire.
* Damaged Weatherstripping: Replace the damaged weatherstripping. This usually involves carefully removing the old stripping and adhering the new stripping in its place.
* Rust Repair: Rust repair is a more complex process and may involve removing the rusted metal, treating the area, and applying filler. This often requires specialized tools and skills.
3. Tools and Materials:
Depending on the repair, you may need:
* Automotive sealant
* Epoxy
* Weatherstripping adhesive
* Replacement weatherstripping
* Body filler (for larger repairs)
* Sandpaper
* Primer
* Paint (matching your car's color)
* Compressed air
* Wire
* Cleaning supplies
4. When to Seek Professional Help:
If the leak is significant, the damage is extensive (like significant rust), or you're uncomfortable performing the repairs yourself, take your Grand Prix to a qualified auto body repair shop.
Remember to always prioritize safety when working on your car. If you are unsure about any aspect of the repair, seek professional help. Ignoring a trunk leak can lead to more serious problems like rust and electrical damage.
