There should be an evaporator case drain tube underneath the vehicle on the firewall. Sometimes they can be tricky to locate. this video will help
Safely raise the vehicle and - from underneath - look closely for the tube. Most times they can be unclogged, but if it has been happening for some time, it can lead to premature evaporator corrosion/failure.
Thursday, October 6th, 2011 AT 9:57 PM