A/C leaking
 

I just got my A/C fixed in my 2002 Buick Century. What I am noticing now is that whenever the a/c is on and running water leaks from under the dash on the passenger side, causing a lot of water to pool on the floor. When I say pool, I mean you could float an empty bottle on the water that forms here.

What could be the problem?
What does it cost/how have you solved the problem if this has happened to you?

Your problem has a simple solution. There is an evaporator drain that drains the condensate from the evaporator core that exits under the air conditioning unit. It is a rubber tube that is located next to the firewall on the passenger side under the hood in the engine compartment. Once you locate it , just make sure it is open for the water to drain. Sometimes you can insert a piece of wire into the hose to clear it. Let me know if you need any further assistance.

x2 on what Hanky said. More than likely thats your problem.