Why does the water leak in the toyota sienna trunk?

Water leaks in the Toyota Siennas trunk can be a cause for concern. They are sometimes caused by malfunctioning HVAC systems, specifically the drain hose. A clogged drain hose for the rear AC may be the culprit behind Your water leaks. This drain hose is situated behind the jack of the vehicle. You will need to pull this hose off from the evaporator and blow some compressed air through the hose to have it properly cleaned. After clearing whatever had it clogged, the water leaks should stop. If the problem persists, then look at the seals of the trunk. Extreme weather or aging can cause the seals to dry our and crack. This in turn lets water get into the trunk.