1. Confirm it's the AC:
* Timing: Does the leak only happen when the AC is running? If not, the problem is something else entirely (like a blocked drain, sunroof leak, or even a crack in the windshield).
* Smell: Does the liquid smell sweet? This is often indicative of refrigerant, but be careful, as refrigerant can be harmful. If you suspect refrigerant, do not attempt further diagnosis yourself. Get it professionally assessed.
2. Possible Causes & Solutions:
* Evaporator Core Leak: This is the most common culprit. The evaporator core is a heat exchanger that cools the air. Over time, corrosion or physical damage can cause it to leak. Repair requires professional help. It involves accessing the evaporator core (usually a significant dashboard disassembly), replacing it, and recharging the AC system with refrigerant. This is not a DIY job for most people.
* Condensation Drain Clog: The AC system produces condensation. This condensation normally drains outside the vehicle through a drain tube. If this tube is clogged (with leaves, debris, or simply dried-up condensation), the water can back up and overflow into the passenger compartment. You can attempt this DIY:
* Locate the Drain: Find the drain tube (usually near the firewall, behind the glovebox or under the dashboard). It might be visible after removing some trim panels.
* Clear the Clog: Use a long, thin, flexible object (like a coat hanger or a shop vacuum with a long attachment) to clear any obstructions in the drain tube. You might need to flush it with water.
* Check for Drainage: Once cleared, run the AC to see if the water drains properly.
* Seal Failure Around the Evaporator Core: Sometimes the seals around the evaporator core can fail, leading to leaks. This requires professional repair, often involving replacing the core as well.
* Refrigerant Leak (Less Likely): While a refrigerant leak *could* contribute to a wet floor, it's more likely to be accompanied by a noticeable lack of cooling power from the AC. Again, don't attempt to troubleshoot refrigerant leaks yourself. This is a job for trained professionals.
What NOT to do:
* Don't drive with a suspected refrigerant leak.
* Don't attempt to repair the evaporator core yourself unless you have significant automotive experience and the proper tools.
* Don't use just any shop; find a reputable auto AC repair specialist.
In summary: Start by confirming the leak is related to the AC system. If the drain is clogged, attempting a DIY fix is relatively straightforward. However, if the evaporator core is the source, professional help is absolutely necessary. They have the tools, experience, and safety equipment to handle the refrigerant safely and repair the leak properly.
