98 caravan, clogged evap drain?

Just purchased said vehicle, after researching a bit, found that some
people are having problems with water in the passenger footwell from a
clogged drain. I'm getting the same thing (sounds like water sloshing
around behind the glove box). Water isn't pouring in, discovered it by
pulling back the carpet and insulation. Anyways, I think I found the
correct drain hose on the firewall side. There is a small protrusion on the
firewall, and a black hose hangs down from the bottom of it. What's the
standard method for clearing this? Do I need to pull the hose off, or can I
just blow some compressed air through the tube? Seems like it may be a pain
in the arse to get that hose back on. As far as I can tell and from what I
have read, there is no way to access this from the interior of the vehicle
without tearing the dash apart. Well, if anybody can supply any
information, it would be much appreciated.

SoF

 

Behind the glove box there is a small irregularly shaped
access panel ( 2" at bottom, 3" at top, 4" high) where some
temp sensor wiring feeds into the compartment housing the
evaporator. Perhaps you could pour some water mixed with bleach
into it and suck it out through the drain in the firewall
using a shop vac. Otherwise you are stuck removing the
entire dash.

Paul

 

the best way to clear it. is drill a hole in the center inside the car and then
blow air through the drain then seal the hole with butyrl