[200q20v] Re: [200q20v]another defrost problem

Kneale Brownson knotnook at traverse.com
Wed Dec 5 15:17:46 EST 2001

You probably have a plug in the larger drain that lets water out from the
area covered by the plastic rain diverter that covers the area from the
bottom of the windshield to the top of the firewall.  If you remove the
spongy seal along the top of the firewall and pry up the clips holding the
front edge of the diverter, you can flex the diverter up enough to see
what's underneath.  In about the center of the cavity there is a white or
black box that houses the heater core and blower fan assembly and on the
passenger side is the A/C evaporator box.  These two are linked by a round
plenum that lets air from the evap box get to the fan.  Beneath the plenum
just behind the vertical part of the firewall there's a large rubber
gromet-with-a-tail that lets water flow out behind the engine.  I clean
that area out with a shopvac crevice tool each fall after the leaves have
all fallen off, so I've never had an accumulation of water there.  I
imagine that if a mat of leaves, pine needles, acorns and rodent nesting
materials formed there, the drain wouldn't drain very well.

The other possibility is that the drain for the inside of the evap box has
plugged.  This is a greater problem because there's no fixing it I've been
able to figure out without disconnecting the A/C lines and removing the box

At 01:22 PM 12/05/2001 -0500, Tresturbos at aol.com wrote:

><< The misting of the windows with the defroster on sounds like you may
>have a problem with the broken fresh air flap or a bad heater core. Does it
>smell like antifreeze when the defrost is on?
>If it does not clear, it is also possible that your A/C compressor is
>not working properly, as that should clear any condensation before it
>happens. >>
>Interesting that this should come up, as I was going to ask about this kind
>of problem as well.  Only in my case, the defrost works fine for long periods
>of time, only to completely fog the windows after driving through a curvy
>section of road just a 1/2 mile from home.  It fogs up quickly, and so
>extensively that if I didn't roll down all the windows, I wouldn't be able to
>see my way home! One time, when I left the windows closed, I parked on the
>side of the road and waited about 10 minutes for it to even partially clear
>I'm thinking that in the curves, water must be sloshing into an opening
>somewhere in the ventilation path. Not knowing how the system works, I
>haven't a clue what to look for.  BTW, every time this has happened, the
>outside temperature has been sub 37-40 degrees(f).
>Any recommendations or advice would be appreciated.
>Mitch Frey
>Portland, Oregon
>'91 200tq IA Stage 3
>'00 A6 2.7T
>200q20v mailing list
>200q20v at audifans.com

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