1. Identify the Leak Source:
* Visual Inspection (Exterior): Start with a thorough visual inspection of the rear window and its surrounding area, both inside and outside the truck. Look for:
* Cracks or gaps in the window sealant: This is a common cause. Look closely at the seams where the glass meets the body.
* Damaged weatherstripping: Inspect the rubber seals around the window. Are they cracked, brittle, torn, or missing?
* Holes or rust: Check for rust around the window frame, as this can create pathways for water entry.
* Clogged drains: The rear window area often has drainage channels. Make sure these aren't clogged with debris.
* Visual Inspection (Interior): With a helper, use a garden hose to carefully spray water around the rear window while someone inside watches for water entry points. Pay close attention to the seams and the upper corners where water often collects. A strong flashlight can help spot leaks.
2. Addressing the Problem Based on the Source:
* Sealant Failure: This is likely the most common cause. Repairing requires careful removal of the old sealant, cleaning the surfaces thoroughly, and applying new sealant. This usually involves:
* Removing the interior trim: This allows better access to the window and sealant. Consult a repair manual specific to your 2003 Ranger for detailed instructions.
* Removing the old sealant: Use a plastic putty knife or other suitable tool to carefully remove all the old sealant. Be gentle to avoid damaging the paint or window.
* Cleaning the surfaces: Thoroughly clean the window and body surfaces with a suitable solvent to remove any remaining sealant, dirt, and debris.
* Applying new sealant: Use a high-quality automotive-grade urethane sealant. Apply a continuous, even bead, following the manufacturer's instructions.
* Reinstalling the interior trim: Once the sealant has cured (usually 24-48 hours), reinstall the interior trim.
* Damaged Weatherstripping: Replacing damaged weatherstripping is often simpler. You can usually find replacement weatherstripping at auto parts stores. It's generally a matter of carefully removing the old stripping and adhering the new stripping in its place.
* Holes or Rust: Rust repair is more involved and may require professional help, especially if the rust is extensive. It might involve rust removal, bodywork, and repainting.
* Clogged Drains: Clear any blockages in the drainage channels with compressed air or a small, flexible tool.
3. Tools and Materials You Might Need:
* Garden hose
* Flashlight
* Plastic putty knife
* Solvent (e.g., denatured alcohol)
* Automotive-grade urethane sealant
* Replacement weatherstripping (if needed)
* Repair manual for your 2003 Ford Ranger
* Safety glasses
* Gloves
4. When to Seek Professional Help:
If you're not comfortable performing these repairs yourself, or if the leak is severe or you can't identify the source, it's best to take your Ranger to a qualified auto glass repair shop or body shop. They have the experience and tools to diagnose and fix the problem effectively.
Important Note: Always refer to a repair manual specific to your 2003 Ford Ranger for detailed instructions and diagrams. Improper repair can worsen the problem or damage other components.
