Here's a breakdown of the likely causes:
* Clogged Drain Line: This is the most common culprit. Leaves, debris, or even mold can block the drain tube, preventing water from escaping.
* Evaporator Core Leak: A leak in the evaporator core (the component that cools the air) can cause refrigerant to leak, potentially mixing with condensation and creating excess water. This is more serious and requires professional repair.
* Condenser Leak: Less likely to cause interior flooding, but a leak in the condenser (located outside) could still contribute to excess moisture if it's severe enough.
* Improper Installation (if recently serviced): If the AC system was recently serviced or repaired, it's possible the drain line wasn't properly reconnected.
What you should NOT do:
* Don't just keep using the AC: This will only worsen the problem and potentially cause more damage.
What you SHOULD do:
1. Locate the Drain Line: This is usually a small tube or hose connected to the evaporator housing. It may be accessible under the dashboard or near the blower motor. You'll likely need a flashlight and possibly some tools to get a good look. Searching online for "2002 Dodge Grand Caravan AC drain location" will help you find specific instructions and diagrams.
2. Clear the Drain Line: If you find the drain, try carefully clearing it with compressed air or a small, flexible tool like a wire coat hanger. Be gentle to avoid damaging anything.
3. Inspect for Leaks: Once the drain is clear, inspect the evaporator and condenser for any signs of leaks (water stains, refrigerant). This might require professional help.
If you are uncomfortable working on your vehicle's AC system, it's best to take it to a qualified mechanic. Ignoring the problem could lead to mold growth, damage to electrical components, and more extensive and costly repairs. A professional will be able to properly diagnose the issue and perform the necessary repairs.
