I had new evaporator replaced in my 2001 Jeep Cherokee last August, all was well. This year when ac was on I had water dripping inside cabin under dash in passenger and sometime driver side, then my ac was not cooling. Blend door Motor was rusted had it replaced. I still have water dripping inside but only when I do not use the whole car mode of cooling or it’s in a low fan speed. This evaporator was not oem. Could this be why it’s not draining? Nothing is clogged and water is coming out of drain from firewall .

 

Sounds like the drain is blocked - there is this stupid styrofoam tray that helps direct water to the actual drain opening and it falls apart over time.

Try sticking a coat-hanger or something up the drain line and see if you can clear it out. Do you get any water dripping out of the HVAC drain (in the engine bay by the heater core hoses, passenger side).