2003 Mercury Marquis Air conditioner

Run the self diagnostic test on it by turning the key to on, then press off and floor at the same time, then within 2 secs, press auto, If there is a problem a trouble code will appear on the display. To exit self test, press the BLUE, cooler button this also retains error codes, To erase codes and exit, press defrost, choose one of these before you power down the system. Test with engine at 120 degrees or more, and cabin between 40-90 degrees. Post any codes recorded here and I let you know what's defective.
As for the water, the a/c drain may be clogged. Use a piece of wire and clear the drain tube, it's on the passenger side at the bottom of the firewall.

888 means all the actuators and eatc unit are OK. You can also reach the drain inside on the passenger side, peel the rug back, and you will see a small black elbow that runs from thew case into the firewall, poke a hole downrd thru it, clear it with the wire, and some compressed air, a can of computer duster will work, Then plug the hole you poked with some RTV.