If you hear water sloshing around under your dash and it seems that you’re not leaving a water trail of condensation under your car (which is normal) after running your A/C, it could be that your Evaporator drain is clogged up. Here is a thread where our member, tailor contributed with photos showing the location of the drain hose and how to unclog it. Thanks tailor! Btw, water and debris clogged up in the evaporator drain hose means an early death of your evaporator. To replace it means taking the entire dash out (see post in this database regarding that procedure) but amazingly unclogging its drain is fairly easy as it’s not difficult to access.
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