1. Locate the Water:
* Where is the water coming from? Is it dripping from the headliner, the floor, the trunk, or somewhere else? Knowing the location is crucial.
* When does it leak? Is it only after rain, after washing the car, or even when the AC is on? This helps narrow down the possibilities.
* How much water is leaking? A small drip is easier to track than a torrent.
2. Common Leak Sources in Older Cars:
* Sunroof Drain Tubes: Clogged sunroof drain tubes are a VERY common culprit. Water backs up and overflows into the car. Check these first. They're usually located in the corners of the sunroof opening. You might need a small hose and compressed air to clear them.
* Windshield Seal: A leak around the windshield is also very common. Look closely at the seal for cracks, gaps, or deterioration. Water can seep in during heavy rain or when washing the car.
* Weatherstripping: Check all weatherstripping (around doors, windows, trunk) for wear and tear. Gaps allow water entry.
* AC Drain: If the leak happens when the AC is on, the AC drain line might be clogged. This line drains condensation from the AC system. A clogged line can cause water to overflow inside the car. The location varies by car model but is often near the firewall.
* Holes in the body: Rust or damage to the body panels can create entry points for water. Inspect carefully, especially around seams and lower panels.
* Tail Light Seals: Similar to the weather stripping, poor seals around tail lights can allow water entry, especially during heavy rains.
3. Troubleshooting Steps:
* Visual Inspection: Thoroughly inspect the interior and exterior of the car, looking for evidence of water damage (stains, rust, mildew). Pay close attention to the areas mentioned above.
* Water Test (if possible): If it's raining, or you can safely simulate rain conditions (carefully hosing the car down), observe where water enters. Have someone inside watching for leaks while you hose down suspected areas. Do not use a pressure washer. A gentle stream is sufficient.
* Professional Help: If you can't find the leak yourself, take your car to a mechanic specializing in older vehicles. They have the experience and tools to diagnose and repair the leak.
Important Note: Delaying the repair of a water leak can lead to serious problems, including mold growth, rust damage, and electrical shorts. Address it promptly.
