Keep the drain ports clear in the:
-Engine compartment back corners (by the hood hinges)
-Trunk (underneath the carpet in trunk)
-Sunroof(DRain empties behind back tire, between back tire/wheel well.

As for AC-see if the pully to the compressor is engaudeing when AC is turned on. If the pulley is NOT enguageing -check the relay. The Relay has a habit of overheating.