Thanks for the info. Would it make sense for the evaporator drain hose to
go from the evaporator housing into the firewall? That's the best I can
tell, it seems funny though, to have it go through the firewall only to go
under the car.
In the mean time, I removed the heater resistor from the evaporator core
box, taped it over with small hole, started the A/C on "Normal", and
sprayed the core for about 10 seconds thoroughly with Wynn's air
conditioner treatment (or similar name). It's supposed to be sprayed into
the air vent, but this seemed more direct. Anyways, seems to work for now.
In case the condensate hose is indeed plugged, I will be running on high
fan speed all the time, and "Normal" (not max, which recirculates) in order
to generate less condensate.