Hear water swishing inside of car by the A/C.

The AC condensate drain tube is plugged. Look under the hood on the passenger side of the firewall. There will be a 4" rubber tube with a 90 degree bend hanging down. Squeeze the end to open it up and dislodge the debris. If nothing comes out, squeeze the wire ring to remove the tube, then carefully stick a pencil in the plastic spout to clear the opening.