Toyota Avalon water accumulation in right rear passenger seat during rain despite previous repairs on Toyota Avalon

Some Toyota Avalon owners report experiencing water accumulation in the right rear passenger seat during rain, even after previous repairs. This issue may stem from clogged sunroof drainage tubes, which can lead to leaks if not functioning properly. Additionally, faulty door seals or improper sealing around the doors can allow water to enter the vehicle, particularly during heavy rainfall. Some owners have also noted external water breaches from the sunroof, windshield gaskets, or windows, contributing to the problem. Furthermore, HVAC system issues, such as problems with the air conditioner evaporator or heater core, can result in moisture buildup inside the vehicle. To resolve the ongoing water accumulation, it is advisable for owners to conduct a thorough inspection and address any potential leaks or malfunctions promptly to prevent further water damage to their Toyota Avalon.