Common Causes of Water Leaks in Cars
Water inside your vehicle can come from several sources:
- **Worn door seals** — the most common cause
- **Blocked sunroof drains**
- **Damaged windscreen seal**
- **Clogged AC drain tube**
- **Corroded body panels**
How to Test Your Door Seals
The Garden Hose Test 1. Close all doors and windows 2. Have someone inside the car with a torch 3. Direct a garden hose at the door edges, starting from the bottom and working up 4. The person inside checks for any water ingress
The Paper Test 1. Place a sheet of A4 paper between the door and the seal 2. Close the door 3. Try to pull the paper out 4. If it slides out easily, the seal isn't providing adequate compression 5. Repeat around the entire door perimeter
When to Replace vs Repair
**Replace** if: - The seal has cracks, tears, or chunks missing - The rubber has gone hard and doesn't compress - The seal has pulled away from its mounting - Water consistently enters despite cleaning
**Repair** if: - A small section has come loose (re-glue with seal adhesive) - Surface contamination is preventing proper sealing (clean thoroughly)
Prevention Tips
- Clean door seals monthly with warm soapy water
- Apply silicone rubber conditioner every 6 months
- Never slam car doors — it accelerates seal wear
- Park under cover when possible to reduce UV exposure