1. Clogged Drain Channels: The sunroof drain channels may be clogged, preventing water from draining properly. Check and clear any obstructions in the drain channels.
2. Faulty Weather Stripping: Worn or damaged weather stripping around the doors, windows, or windshield can allow water to seep in. Inspect the weather stripping and replace any that is damaged.
3. Leak in the Heater Core: A leak in the heater core, which is responsible for providing heat inside the vehicle, can cause water to leak onto the passenger side floor. Check for leaks in the heater core and repair or replace it if necessary.
4. Damaged Firewall Seal: The seal between the firewall and the passenger compartment may be damaged, allowing water to enter the vehicle. Inspect the firewall seal and repair or replace it if necessary.
5. Air Conditioning Condensation: If the air conditioning is used without proper drainage, condensation may accumulate and leak onto the passenger side floor. Ensure that the air conditioning drain hose is properly connected and unclogged.
6. Damaged Cowl Panel: The cowl panel, located at the base of the windshield, may have cracks or holes that allow water to enter the vehicle. Inspect the cowl panel and repair or replace it if necessary.
It's important to identify and fix the source of the leak promptly to prevent damage to the vehicle's interior and components. If you're not comfortable troubleshooting and fixing the leak yourself, it's best to take the vehicle to a reputable mechanic for diagnosis and repair.
