Terrence B
Your drain line gets clogged due to road debris and dirt build up over time. All cars with A/C are prone to it.
https://www.youtube.com/watch?v=ISIdAJnP0zs
Bertsta
The drain tube is blocked.. get under the car and ream it out
thebax2006
Clean out the evaporator drain tube.
Old Man Dirt
Some times the condensate drain line gets plugged or becomes disconnected from the bottom of the bottom of the heater box. The hose is not that hard to replace and is often a stock size rubber hose. I run a thick gauged line up mine to unblock it.
Anonymous
You need to find and fix the a/c drain tube which is probably broken or non existent. Condensate should discharge onto the road in normal operation.